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He wonders why Daon and Jaemin aren't dating when they seem to like each other. Sunghyeon is so mature and plays fair that he doesn't want to meddle and ruin their relationship if he knows that they like each other.
Instead of feeling angry, Sunghyeon felt guilty for being jealous. He knows that Jaemin is the person Daon likes and Daon doesn't tremble as he does with Soohyun so he said that he shouldn't meddle with them.
This is the first time that Sunghyeon met Jaemin. There was a lot of tension but Daon chose to shove Sunghyeon away.
Sunghyeon felt guilty because he might be pushing Daon too much so he decided to just be there when Daon needs someone.
The next day, Sunghyeon saw Daon and Soohyun being intimate after Daon told him that Soohyun is just a close hyung.
Sunghyeon asked Daon who Soohyun is and told him that he will accept Daon but he shouldn't lie or hide his circumstances from him. But Daon lied and told him that Soohyun is just a close hyung.
Until Soohyun entered the scene again. Daon remembered awful memories and was scared for his life so he shoved Sunghyeon away as a way to protect him.