Wait, he had a sister? He's an only child isn't he?!
I think that's what the phonecall was for. Like I'm coming over so u can meet ur little sister
Nope he has a lil sister, the mother got remarried and had a daughter with her new husband but Sekye didn't wanna meet her or her new family . It was in one of the last chapters of the main story when he answered her call cause he thought Yijun was the one calling. I guess she kept pushing and now he accepted for exhaustion
yep that should be his sister