It started with a joke, Their resemblance make them close together,

Sometimes unexpected weird days and unwanted accidents can bring together great things...

Xiumin- Kim Minseok, a member of world famous kpop boyband, EXO. Moonbyul- Moon Byul-yi, everyone's girl crush. Mamamoo's handsome 언니.  These two are a doppelgänger of each other. During EXO CBX promotion, MAMAMOO was promoting Decalcomanie as well. Their meeting were slightly an exchange of greetings between them. But somehow Xiumin and Moonbyul had something more going between them without their members knowing. How does it started? And when did they got close to each other?

Xiumin's dull highschool life became a colorful one when he met his look-alike named Moonbyul. Someone might just happen to like their look-alike.

The first thime she saw him she was awestruck. The first time he saw her he had been changed.