My Happy Ending Season 1 Episode 9

Jaewon’s father learns from Yoonjin that Soonyoung cheated on Jaewon. Outraged, he demands to know what Soonyoung plans to do with Jaewon, and they both decide to keep Jaewon in the dark. Soonyoung finds out who Arin’s biological father is and what happened with Jaewon seven years ago.