Chaeyoung and Hyunjin were best friends living in Korea. Mark and Lilah were best friends living in Vancouver but they moved to Korea together when they were 16.
Mark and Lilah got to the same school as Hyunjin and Chaeyoung and they later on become friends.
Lilah and Chaeyoung start to get really close and eventually become best friends. Mark starts crushing on Chaeyoung and tells Lilah. Hyunjin starts crushing on Lilah and tells Chaeyoung. Both of the girls like the guys that were crushing on them.
Chaeyoung starts dating Mark. Later Hyunjin starts dating Lilah.