that's because there is/are
문 열어, 볼 일이 있어서 그래
Open the door. I need to talk to you about something.
— 아마코드 (1973)
어디 갈 데가 있어서 그래
I have somewhere I need to go.
— Tune in for Love (2019)
누나는 멀리 있어서 그래
It's because my older sister is far away.
— 특별한 날 (1977)