diff --git a/migrations/2405310815_create_friend_table.up.sql b/migrations/2405310815_create_friend_table.up.sql
index baace5b..3057d02 100644
--- a/migrations/2405310815_create_friend_table.up.sql
+++ b/migrations/2405310815_create_friend_table.up.sql
@@ -12,8 +12,9 @@ CREATE TABLE friend_bill(
     friend_bill_id uuid PRIMARY KEY,
     relation_id uuid NOT NULL REFERENCES friend(relation_id),
     amount double precision NOT NULL,
-    title varchar(50) NOT NULL ,
+    title varchar(50) NOT NULL,
     description varchar(100) NOT NULL default '',
+    in_debt varchar(30) NOT NULL,
     created_at timestamp NOT NULL default CURRENT_TIMESTAMP
 )
 
diff --git a/protobuf/friend_bill.proto b/protobuf/friend_bill.proto
index 12039ca..54a86af 100644
--- a/protobuf/friend_bill.proto
+++ b/protobuf/friend_bill.proto
@@ -37,6 +37,7 @@ message CreateFriendBillRequest {
     double amount = 2;
     string title = 3;
     string description = 4;
+    string in_debt = 5;
 }
 
 message CreateFriendBillResponse {
@@ -49,9 +50,11 @@ message DeleteFriendBillRequest {
 
 message ModifyFriendBillRequest {
     string friend_bill_id = 1;
-    double amount = 2;
-    string title = 3;
-    string description = 4;
+    string relation_id = 2;
+    double amount = 3;
+    string title = 4;
+    string description = 5;
+    string in_debt = 6;
 }
 
 message ListFriendBillRequest {
@@ -68,4 +71,5 @@ message FriendBill {
     double amount = 2;
     string title = 3;
     string description = 4;
+    string in_debt = 5;
 }
\ No newline at end of file
diff --git a/protobuf/gen/go/friend_bill.pb.go b/protobuf/gen/go/friend_bill.pb.go
index 07f73c1..4db574c 100644
--- a/protobuf/gen/go/friend_bill.pb.go
+++ b/protobuf/gen/go/friend_bill.pb.go
@@ -31,6 +31,7 @@ type CreateFriendBillRequest struct {
 	Amount      float64 `protobuf:"fixed64,2,opt,name=amount,proto3" json:"amount,omitempty"`
 	Title       string  `protobuf:"bytes,3,opt,name=title,proto3" json:"title,omitempty"`
 	Description string  `protobuf:"bytes,4,opt,name=description,proto3" json:"description,omitempty"`
+	InDebt      string  `protobuf:"bytes,5,opt,name=in_debt,json=inDebt,proto3" json:"in_debt,omitempty"`
 }
 
 func (x *CreateFriendBillRequest) Reset() {
@@ -93,6 +94,13 @@ func (x *CreateFriendBillRequest) GetDescription() string {
 	return ""
 }
 
+func (x *CreateFriendBillRequest) GetInDebt() string {
+	if x != nil {
+		return x.InDebt
+	}
+	return ""
+}
+
 type CreateFriendBillResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -193,9 +201,11 @@ type ModifyFriendBillRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	FriendBillId string  `protobuf:"bytes,1,opt,name=friend_bill_id,json=friendBillId,proto3" json:"friend_bill_id,omitempty"`
-	Amount       float64 `protobuf:"fixed64,2,opt,name=amount,proto3" json:"amount,omitempty"`
-	Title        string  `protobuf:"bytes,3,opt,name=title,proto3" json:"title,omitempty"`
-	Description  string  `protobuf:"bytes,4,opt,name=description,proto3" json:"description,omitempty"`
+	RelationId   string  `protobuf:"bytes,2,opt,name=relation_id,json=relationId,proto3" json:"relation_id,omitempty"`
+	Amount       float64 `protobuf:"fixed64,3,opt,name=amount,proto3" json:"amount,omitempty"`
+	Title        string  `protobuf:"bytes,4,opt,name=title,proto3" json:"title,omitempty"`
+	Description  string  `protobuf:"bytes,5,opt,name=description,proto3" json:"description,omitempty"`
+	InDebt       string  `protobuf:"bytes,6,opt,name=in_debt,json=inDebt,proto3" json:"in_debt,omitempty"`
 }
 
 func (x *ModifyFriendBillRequest) Reset() {
@@ -237,6 +247,13 @@ func (x *ModifyFriendBillRequest) GetFriendBillId() string {
 	return ""
 }
 
+func (x *ModifyFriendBillRequest) GetRelationId() string {
+	if x != nil {
+		return x.RelationId
+	}
+	return ""
+}
+
 func (x *ModifyFriendBillRequest) GetAmount() float64 {
 	if x != nil {
 		return x.Amount
@@ -258,6 +275,13 @@ func (x *ModifyFriendBillRequest) GetDescription() string {
 	return ""
 }
 
+func (x *ModifyFriendBillRequest) GetInDebt() string {
+	if x != nil {
+		return x.InDebt
+	}
+	return ""
+}
+
 type ListFriendBillRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -361,6 +385,7 @@ type FriendBill struct {
 	Amount       float64 `protobuf:"fixed64,2,opt,name=amount,proto3" json:"amount,omitempty"`
 	Title        string  `protobuf:"bytes,3,opt,name=title,proto3" json:"title,omitempty"`
 	Description  string  `protobuf:"bytes,4,opt,name=description,proto3" json:"description,omitempty"`
+	InDebt       string  `protobuf:"bytes,5,opt,name=in_debt,json=inDebt,proto3" json:"in_debt,omitempty"`
 }
 
 func (x *FriendBill) Reset() {
@@ -423,6 +448,13 @@ func (x *FriendBill) GetDescription() string {
 	return ""
 }
 
+func (x *FriendBill) GetInDebt() string {
+	if x != nil {
+		return x.InDebt
+	}
+	return ""
+}
+
 var File_friend_bill_proto protoreflect.FileDescriptor
 
 var file_friend_bill_proto_rawDesc = []byte{
@@ -430,7 +462,7 @@ var file_friend_bill_proto_rawDesc = []byte{
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@@ -439,69 +471,76 @@ var file_friend_bill_proto_rawDesc = []byte{
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+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/services/api/controllers/friend_bill/create.go b/services/api/controllers/friend_bill/create.go
index 0fdbf65..744f09c 100644
--- a/services/api/controllers/friend_bill/create.go
+++ b/services/api/controllers/friend_bill/create.go
@@ -17,25 +17,24 @@ func (s Service) CreateFriendBill(ctx context.Context, req *monify.CreateFriendB
 	if req.Title == "" {
 		return nil, status.Error(codes.InvalidArgument, "Title is required")
 	}
-	if req.Amount <= 0 {
-		return nil, status.Error(codes.InvalidArgument, "Amount should be more than zero")
+	if req.Amount == 0 {
+		return nil, status.Error(codes.InvalidArgument, "Amount should not be zero")
+	}
+	if req.InDebt == "" {
+		return nil, status.Error(codes.InvalidArgument, "InDebt person is required")
 	}
 	_, ok := ctx.Value(lib.UserIdContextKey{}).(uuid.UUID)
 	if !ok {
 		return nil, status.Error(codes.Unauthenticated, "Unauthorized")
 	}
-	relationId, err := uuid.Parse(req.RelationId)
-	if err != nil {
-		return nil, status.Error(codes.InvalidArgument, "Invalid relation id")
-	}
 
 	//Insert
 	friend_billId := uuid.New()
 	db := ctx.Value(lib.DatabaseContextKey{}).(*sql.DB)
-	_, err = db.ExecContext(ctx, `
-		INSERT INTO friend_bill (friend_bill_id, relation_id, amount, title, description)
-		VALUES ($1, $2, $3, $4, $5)
-	`, friend_billId, relationId, req.Amount, req.Title, req.Description)
+	_, err := db.ExecContext(ctx, `
+		INSERT INTO friend_bill (friend_bill_id, relation_id, amount, title, description, in_debt)
+		VALUES ($1, $2, $3, $4, $5, $6)
+	`, friend_billId, req.RelationId, req.Amount, req.Title, req.Description, req.InDebt)
 	if err != nil {
 		logger.Error("Insert values into friend_bill error.", zap.Error(err))
 		return nil, status.Error(codes.Internal, "")
diff --git a/services/api/controllers/friend_bill/list_friend_bill.go b/services/api/controllers/friend_bill/list_friend_bill.go
index 0a7f031..2424ee2 100644
--- a/services/api/controllers/friend_bill/list_friend_bill.go
+++ b/services/api/controllers/friend_bill/list_friend_bill.go
@@ -20,7 +20,7 @@ func (s Service) ListFriendBill(ctx context.Context, req *monify.ListFriendBillR
 	}
 	db := ctx.Value(lib.DatabaseContextKey{}).(*sql.DB)
 	query, err := db.QueryContext(ctx, `
-		SELECT friend_bill_id, amount, title, description
+		SELECT friend_bill_id, amount, title, description, in_debt
 		FROM friend_bill
 		WHERE relation_id = $1`, req.RelationId)
 	if err != nil {
@@ -35,7 +35,7 @@ func (s Service) ListFriendBill(ctx context.Context, req *monify.ListFriendBillR
 			break
 		}
 		var friend_bill monify.FriendBill
-		if err = query.Scan(&friend_bill.FriendBillId, &friend_bill.Amount, &friend_bill.Title, &friend_bill.Description); err != nil {
+		if err = query.Scan(&friend_bill.FriendBillId, &friend_bill.Amount, &friend_bill.Title, &friend_bill.Description, &friend_bill.InDebt); err != nil {
 			logger.Error("Scan friend bill information error.", zap.Error(err))
 			return nil, status.Error(codes.Internal, "")
 		}
diff --git a/services/api/controllers/friend_bill/modify.go b/services/api/controllers/friend_bill/modify.go
new file mode 100644
index 0000000..1829db1
--- /dev/null
+++ b/services/api/controllers/friend_bill/modify.go
@@ -0,0 +1,55 @@
+package friend_bill
+
+import (
+	"context"
+	"database/sql"
+	"monify/lib"
+	monify "monify/protobuf/gen/go"
+
+	"github.com/google/uuid"
+	"go.uber.org/zap"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/types/known/emptypb"
+)
+
+func (s Service) ModifyFriendBill(ctx context.Context, req *monify.ModifyFriendBillRequest) (*emptypb.Empty, error) {
+	logger := ctx.Value(lib.LoggerContextKey{}).(*zap.Logger)
+	_, ok := ctx.Value(lib.UserIdContextKey{}).(uuid.UUID)
+	if !ok {
+		return nil, status.Error(codes.Unauthenticated, "Unauthorized.")
+	}
+	db := ctx.Value(lib.DatabaseContextKey{}).(*sql.DB)
+
+	//START transaction
+	tx, err := db.BeginTx(ctx, &sql.TxOptions{Isolation: sql.LevelReadUncommitted})
+	if err != nil {
+		logger.Error("Failed to begin transaction", zap.Error(err))
+		return nil, status.Error(codes.Internal, "Internal")
+	}
+	defer tx.Rollback()
+
+	// Delete
+	_, err = tx.ExecContext(ctx, `DELETE FROM friend_bill WHERE friend_bill_id = $1`, req.FriendBillId)
+	if err != nil {
+		logger.Error("Delete friend bill error. (Modify)", zap.Error(err))
+		return nil, status.Error(codes.Internal, "")
+	}
+
+	// Insert
+	_, err = tx.ExecContext(ctx, `
+		INSERT INTO friend_bill (friend_bill_id, relation_id, amount, title, description, in_debt)
+		VALUES ($1, $2, $3, $4, $5, $6)
+	`, req.FriendBillId, req.RelationId, req.Amount, req.Title, req.Description, req.InDebt)
+	if err != nil {
+		logger.Error("Insert values into friend_bill error. (Modify)", zap.Error(err))
+		return nil, status.Error(codes.Internal, "")
+	}
+
+	//Commit
+	if err = tx.Commit(); err != nil {
+		logger.Error("Failed to commit transaction", zap.Error(err))
+		return nil, status.Error(codes.Internal, "Internal")
+	}
+	return &emptypb.Empty{}, nil
+}
diff --git a/services/api/test/friend_bill_test.go b/services/api/test/friend_bill_test.go
index 8906462..891e7fc 100644
--- a/services/api/test/friend_bill_test.go
+++ b/services/api/test/friend_bill_test.go
@@ -36,12 +36,14 @@ func TestFriendBill(t *testing.T) {
 		Amount:      300,
 		Title:       "test1",
 		Description: "test1",
+		InDebt:      "friend_bill_nickId1",
 	})
 	_, err = client.CreateFriendBill(context.TODO(), &monify.CreateFriendBillRequest{
 		RelationId:  friendS_relationId[0],
 		Amount:      500,
 		Title:       "test2",
 		Description: "test2",
+		InDebt:      "friend_bill_nickId1",
 	})
 	assert.NoError(t, err)
 	_, err = client.CreateFriendBill(context.TODO(), &monify.CreateFriendBillRequest{
@@ -49,21 +51,46 @@ func TestFriendBill(t *testing.T) {
 		Amount:      0,
 		Title:       "test2",
 		Description: "test2",
+		InDebt:      "friend_bill_nickId1",
 	})
 	assert.Error(t, err) // Amount must not be zero
 
 	// Test list friend bill
-	friend_bills, err := client.ListFriendBill(context.TODO(), &monify.ListFriendBillRequest{RelationId: friendS_relationId[0]})
+	res1, err := client.ListFriendBill(context.TODO(), &monify.ListFriendBillRequest{RelationId: friendS_relationId[0]})
 	assert.NoError(t, err)
-	assert.Equal(t, len(friend_bills.GetFriendBills()), 2)
+	assert.Equal(t, len(res1.GetFriendBills()), 2)
+	assert.Equal(t, 300.0, res1.FriendBills[0].Amount)
+	assert.Equal(t, "test1", res1.FriendBills[0].Title)
+	assert.Equal(t, "test1", res1.FriendBills[0].Description)
+	assert.Equal(t, "friend_bill_nickId1", res1.FriendBills[0].InDebt)
+	assert.Equal(t, 500.0, res1.FriendBills[1].Amount)
+	assert.Equal(t, "test2", res1.FriendBills[1].Title)
+	assert.Equal(t, "test2", res1.FriendBills[1].Description)
+	assert.Equal(t, "friend_bill_nickId1", res1.FriendBills[1].InDebt)
 
 	// Test delete friend bill
-	var friend_billId []string
-	for _, friend_bill := range friend_bills.GetFriendBills() {
-		friend_billId = append(friend_billId, friend_bill.FriendBillId)
-	}
-	_, err = client.DeleteFriendBill(context.TODO(), &monify.DeleteFriendBillRequest{FriendBillId: friend_billId[0]})
+	_, err = client.DeleteFriendBill(context.TODO(), &monify.DeleteFriendBillRequest{FriendBillId: res1.FriendBills[0].FriendBillId})
+	assert.NoError(t, err)
+	res2, err := client.ListFriendBill(context.TODO(), &monify.ListFriendBillRequest{RelationId: friendS_relationId[0]})
+	assert.Equal(t, len(res2.GetFriendBills()), 1)
+	assert.Equal(t, 500.0, res2.FriendBills[0].Amount)
+	assert.Equal(t, "test2", res2.FriendBills[0].Title)
+	assert.Equal(t, "test2", res2.FriendBills[0].Description)
+	assert.Equal(t, "friend_bill_nickId1", res2.FriendBills[0].InDebt)
+
+	// Test modify friend bill
+	_, err = client.ModifyFriendBill(context.TODO(), &monify.ModifyFriendBillRequest{
+		FriendBillId: res2.FriendBills[0].FriendBillId,
+		RelationId:   friendS_relationId[0],
+		Amount:       1000,
+		Title:        "test3",
+		Description:  "test3",
+		InDebt:       "friend_bill_nickId2",
+	})
 	assert.NoError(t, err)
-	friend_bills, err = client.ListFriendBill(context.TODO(), &monify.ListFriendBillRequest{RelationId: friendS_relationId[0]})
-	assert.Equal(t, len(friend_bills.GetFriendBills()), 1)
+	res3, err := client.ListFriendBill(context.TODO(), &monify.ListFriendBillRequest{RelationId: friendS_relationId[0]})
+	assert.Equal(t, 1000.0, res3.FriendBills[0].Amount)
+	assert.Equal(t, "test3", res3.FriendBills[0].Title)
+	assert.Equal(t, "test3", res3.FriendBills[0].Description)
+	assert.Equal(t, "friend_bill_nickId2", res3.FriendBills[0].InDebt)
 }