When outcast Park Seyeon finally gave up on trying to make new friends, after being isolated from the class by her ex-best friend, Things seem to make a turn for a better when indifferent Lee Jihoon transfers to her class. After making unlikely friends with the twelve boys that consist of Jihoon's friend group, life begins to turn around for Seyeon. Hopefully that luck can not only work in her social life, but her love life too.