Everyone knows that Sungyeol and Sungjong love each other and how much the care for each other. 

They all thought the two would be happy with each other. But when Sungjong catches Sungyeol with another guy, it breaks his heart and everything changes. 

Sungjong stops talking to him completely. At first everyone thought it would affect his performances, but they were wrong. he could still perform well, although he couldn't seem to trust anyone.

Everyone was worried he would isolate himself from them one day. He tend to do things one his own. When he made mistakes he would correct himself not wanting the others to help him.

One day Sungyeol wanted to fix things and talks to Sungjong. He tells him he'll be a better man if he's given ONE MORE CHANCE.