Not many actually know, but Byun Baekhyun has a twin four minutes older than him; his name is Byun Baekgyu.

So one day, when someone comes up to Baekhyun and confesses to him his undying love, Baekhyun immediately tells him that he has the wrong person. Instead of what he guesses is Baekgyu's ex-lover backing away, the guy begins insisting that Baekhyun is- in fact- Baekgyu and that he shouldn't be lying.

After a phone call with his older brother, Baekhyun is given the task of pretending to be his twin for one whole year; until Baekgyu comes back from Tokyo. He is told to kiss, hug, and pretend to love someone he's barely just met.

And to top it off?

Baekgyu's ex-boyfriend is also his roommate.