Kai and Kris are step brothers. They really hate each other. Both of them are still highschoolers. Kris is 18 years old while Kai is still 17 years old. They live in Busan for 5 years now. but then Kai's mother got a new job at Seoul and they have to move to Seoul as soon as possible. At first, Kai thought it was a bad idea to move to Seoul. But day by day he then found this idea a bit