Every wondered what it's like to fall in love with a stranger and one day this stranger becomes literally the air you breath! 

Namjoon is an ordinary guy who fears dreaming , gives up college due to financial problem and is working at a local grocery shop. When one day he meets Jin ; a trainee who never knows when he'll be able to debut , falls deeply in love with each other.

At first it was all new and sweet but when they had to face reality , they were a young forbidden love. Things start to get complicated when Jin is set to debut.

Will they give up on each other or find the endless / infinite loop to their love?