I think that friend of jihwa and heena was the one to put that dead body in the well and when seung ho and na-kyum were going to the river at night and seung ho was staring at the well he must have been saw that corpse of fake in-hun...its just my thoughts
I'm so happy that I'm scared...I'm scared that jihwa's friend will do something to na-kyum...scared that seungho and na-kyum will go through breakup...