
I know people are frustrated but cut YuYang some slack.
He's insecure and terrified. You saw how his family reacted about him coming out, not to mention they live in China, a country where they literally beat you up or send you to prison if they catch you doing any homosexual acts.
Plus its definitely terrifying to suddenly have a person confessing their love for you when all you have experienced is hate and anger. The way he cried expressed how he is running away and regrets being so consumed by his emotions. Give him time, give both of them some time.
We all want to see them finally together but honestly, the author went for a realistic approach that not every story is all rainbows and butterflies. The struggle is part of the journey and these boys are going through a lot so what we should do is support them in their journey no matter what happens.

Exactly! I had a relationship that was like this, myself. Both me and my girlfriend were like Yu Yang, but we could be like Li Huan at times, too. She hurt me and I hurt her. It was not intentional, we were only scared of people finding out about us. Eventually, people did, and we are now broken up, so yeah. I can see why Yu Yang is terrified. Coming out and being in a same-sex relationship is scary depending on your situation.
This story deals with such heavy issues about society and conforming to the norm.
Saegye is bearing such a heavy burden. If he doesn't help, someone innocent would be framed but if he does, he exposes himself and the rest like him to a cruel and unforgiving world. Either way, he bears the guilt and I think its unfair for such a young man to bear so much guilt and hurt for something he's not at fault for.
I don't think he could help by just mentioning that he saw the culprit push the idol down the stairs. If it was that easy, Han could have asked someone else to do it for him, it didn't necessarily need to be Saegye.
Think about it, if Saegye was the one to say it, people would question why was he there at the scene of the crime, how could he prove he was there, wasn't he student supposed to be in school? So that definitely wouldn't work, since he is the only on who could lie, the brother can't be asked to cover for him.