When you meet your best friend after 2 years from being away, not talking to each other. It was your sister wedding. she married him, Junmyeon which mean you had no choice but to run into him again, Park Chanyeol. 

Confusion of feeling is the most hard things. Were you his baby? His lover? His best friend? Why had you never been honest before? 

You knew that he was the only one for you and your mind kept going for that time when you both were something, and hiding behind the word, friends!