I don't get why both saeyoon and eunsung don't speak directly to jaehyun about his friend's evil plan the whole time!! If they just spoke up it'd have never been the case (/TДT)/
for eunsung, it's quite simple, jungwoo traitened to leek the photo in which they kiss if he tells him anything and if he doesn't break up. He don't want jeahyun to suffer because of him. As for Saeyoon, we probably don't know yet
kyaaa I wish i was her I'd have so much fun with these sexy men (づ ̄ ³ ̄)づ