Jaekyung and seerim have been enemies from elementary school, they were best friends since they're 4 years old. seerim mom and Jaekyung mom are best friends, but it's not happening to Jaekyung and seerim, they keep fighting every time they meet. Jaekyung and seerim got into the boarding school, where they're staying at the hostel as long as the learning period is still going. they got their own room in that hostel, they should learn new things every day, studying and make an achievement.