Kim Jongin came back after undergoing a psychiatrict treatment due to a car accident they encountered causing for his son's death and wife in coma. He received a post-letter from his ex-wife Do Kyungsoo written four years ago containing all his sufferings. What if he finds out the secret hidden from him? Will he choose to rewrite their story or erase it? Find out.

Well, the title says it all, that My Boyfriend is a Gay