Tangled up on you

Chaeyeon, Sakura, and Hyewon are best of friends since they were kids.They were known as the 3 masketeers.
Minju is Hyewon's younger sister. In high school Minju joined the gang and they became F4. Sakura is known as the campus heartrob, most of the students have a crush on her, even Hyewon has a crush on her but Sakura has her eyes on her best friend, Chaeyeon.