I got this idea from listening to 'Choose Me' by vocaloid. 

Hakyeon and Taekwoon have been having a very healthy relationship with one another. Even if Taekwoon didn't speak, Hakyeon would be able to tell how he feels. They felt like they were in perfect sync up until Taekwoon introduces Wonsik to him. After that Hakyeon has been ignoring Taekwoon by only being on his mobile to speak with Wonsik. Taekwoon regrets having the two met being envious each and every day. It only grows worse when Wonsik falls for Hakyeon causing a debate in his mind of confessing to Hakyeon or keeping it to himself in order to keep his friendship with Taekwoon. All three feel so torn apart it hurts. It's all up to Hakyeon to choose whom he wants. Does he choose his current boyfriend that he loved for a while now, or gain a new relationship with Wonsik? Either way someone has to have a broken heart...