How do you come to terms with reality when you've found out you're attracted to a mentally challenged moron? 

In baekyun , whose extremely upset with the fact that taeyeon, Suho's moron cousin ,has to spend the holidays with them. 

Taeyeon, whose a sixteen year old with the mentality of only a ten year old.

Suho, who has to babysit Taeyeon for the holidays

Doppelganger , of taeyeon.  Baekhyun's drug.