A girl, Min Hyun, travels to Korea to attend Seoul University. The flight she takes changes her life forever...

Why was love so complicated? Why couldn't it be simple like eating and sleeping?   He was so distant now... Always hanging with the 'cool' people. Not even glancing at me. Why was it like this?   How come he couldn't just love me and not think about anything else...  

Key has been in a relationship for a while... he loves his boyfriend a lot and his boyfriend says he loves him back. But it definitely isnt right....because his boyfriend does not act like he loves Key at all. All the love, happiness and safety disappeared from Key's life, becoming strange, foreign things, until he crossed paths with an angel...