Joy, Irene, Seugli and Wendy are four half-sisters who share the same father but different mother, the girls were awkward with one another at first but got close to each other after another kid bully Irene their oldest sister. Ever since then the four girls has been each other best friend, their first and second year of high school was normal until they had to transfer to a different school across the city. Going to a new school and knowing nobody there but they’re able to manage it well on the first few days until Joy got into an argument with Soojung who happens to be the girlfriend of a very popular boy name Jb, the argument started it as yelling and turn into a fight with her sister on the scene they helped when Soojung friends joined in causing Jb and his friends to pull the girls apart. They were all force to clean the school every day after school for a whole month, getting along wasn’t in their book but fate had other plans.

Joy / Irene / Seugli / Wendy

Mark / Jb / Yugyeom / Jr / Jackson / Youngjae / BamBam

Taehyun / Mino

Soojung / Jiae / Miju / Myungeun / Soojung / Yejn