Responses
Probably because he lives near the daycare.
Anyways it's not strange for grandparents to take care of grandchildren in order to help their sons, so it's nice to see things reversed, in this case the son is helping his parents. I do agree with you tho it is weird.
Their mom is in US and she probably wanted her youngest son to grow up in kor instead of us so maybe that's why he's living with his bro
Why is Hyun raising Hyunwoo when their mom is alive and well? At first I thought Hyunwoo spends couple of nights a week at his brother's house but it seems to be a daily occurrence. It's strange.