Exactly!! The one good thing he ever had to himself aka somone who he could always depend on came back into his life like why else wouldn't he be tempted!? It's very realistic if you ask me idk why everyone is crying saying "oh I thought he was smarter" and "he is susposed to hate him" he is miserable !!! He likes the idea of Jihwans good traits it's just like a irl manipulative toxic relationship!
Thank you for point that out. Of course, Soo-young will be tempted. He wants to freely attend the uni, without having working part-time all day. Having warm and comfortable house, even it's more like a cage.
In a life so shitty, I understand Sooyoung liking Jihwan's attention. Poor guy..