Jessica Jung and Tiffany Hwang.

What to talk about the relationship of the most popular girls from West High School?

Well, the whole college knew their relationship was not good, due to Jessica and Taeyeon relationship.

Jessica and Taeyeon were best childhood friends until Jessica discovered that her father was betraying her mother with Taeyeon's mother and that Taeyeon knew about it and hid from her.

After that, the relationship between them changed completely, especially after Jessica's father and Taeyeon's mother took over their relationship.

The two began to live a cold war, especially on the side of Jessica who didn't forgive Taeyeon and constantly attacked with sarcastic comments in high school.

After that Taeyeon approached Tiffany and Sunny, becoming friends. 

Tiffany had nothing against Jessica, until she started getting sarcastic and hateful comments from Jessica because of her friendship with Taeyeon.

Jessica became friend of Yoona, Yuri and Hyoyeon, the four studied in the same college for years, but only went to become friendly, after by coincidence
are on holiday in Italy.

Now with the beginning of classes coming back
What will happen at West High School?