S1·E15 That Isn’t My Mom, Right?

Soo Ji tells Si Hyun that his dad is seeing some other woman. He demands to know who she is, but Soo Ji does not tell him exactly who she is. Meanwhile, Se Joo and Soo Ji decide to go to a street bar. There, Soo Ji spots Seok Woo and Young Won on a date, having a drink together.