Minhyun, Jonghyun, Minki and Dongho are friends. 

Jonghyun like Minhyun but Minhyun claims that he's straight like ruler.  

So, Minki said "there have flexible ruler and you can bend it,Jonghyun."

"But Minki, even it flexible and I can bend it... it will always be straight again."

" Why you always make something simple be complicated? Just confess to him."

And everything turns not so good between minhyun and jonghyun.