Kang Chan and Seyeon became dear friends while still young, thanks to an introduction by their parents. However, things took a new turn in high school when Kang Chan professed his love for Seyeon. This newfound awareness of Kang Chan led to a love triangle situation involving Naeun, who disapproved of their relationship. From then on, their story became full of trivial and raucous episodes, involving those around them.