Jay Jung was living a good life. Getting good grades, Dating Lee Jooyeon, No problems. Well that was back then. But everything turns into chaos the moment his ex Tiffany Hwang returns from California. This isn't it, Tiffany's determined to break up Jooyeon & Jay and make Jay hers again. Now, this will be the beginning of the stress factor for Jay. As Tiffany continues to slowly mess with Jooyeon just to be with Jay, Jay's fighting for everything to be stable for Jooyeon & him. However, in the end did Tiffany's plan work? Who will Jay choose? Who ends up together? Now let the chaos begin. 

*Note: I know it's pretty weird for a 20 year old to be in school with others but I was thinking to make this school kinda like from High School - College

Jessica Jung ( Jung Sooyeon )
Age: 20
- Attends Jeongku High
- Cold Hearted but warm hearted when you know her 
- Majoring in music
- Tiffany's best friend 
- Eldest in Jung family

Krystal Jung ( Jung Soojung )
Age: 18
- Attends Jeongku High
- Cold hearted but really dorky when you know her
- Loves to mess around with Jay
- Eats a lot
-2nd oldest & youngest daughter

Jay Jung ( Jung Jaewon )
Age: 17
- Attends Jeongku High
- Cold, but really kind when you get to know him
- Youngest & Only son of the Jung family 
- Has a really gentle heart
- Sica & Krystal love him & spoil him to death

Tiffany Hwang
Age: 20
- Youngest in Hwang family
- Jessica's best friend
- Jay's Ex
- Returns to Korea after breaking up with her previous boyfriend
- Wants to get Jay back

Lee Jooyeon
Age: 18
- Youngest in Lee family
- Attends Jeongku High
- Jay's girlfriend
- Has a playful personality 
- Clingy & dorky with Jay

Lay Zhang
Age: 17
- Attends Jeongku High
- Really kind, weird & caring
- Only child in the Zhang family
- Best friends with Jay & Luhan
- Thinks of Jay & Luhan as his brothers

Xi Luhan
Age: 17
- Attends Jeongku High
- Really caring, funny & wild
- Only child in Xi family
- Best friends with Jay & Lay
- Cares about Jay & Lay 

OTHERS:

- SNSD
- EXO
- AFTER SCHOOL
- & Others. But they're not main people.