Joonmyun doesn't know what Lay is. Doctors describe him as an Illness that Joonmyun suffers from but that doesn't explain the haunting, it doesn't explain the pain and it doesn't explain any of the harrowing articles that Kim Jongin diggs up after walking back into Joonmyun's terrifying wreck of a life.  Lay is Joonmyun Joonmyun is LayThey are two sides of one person.  But that isn't quite true.