Kim Taeyeon

• A very short-tempered girl who works hard to pay their father's debt.
• Has a lot of jobs.
• For some reason, Jaejoong's famous smile won't work with her.                                                                                         

 Kim Jaejoong

• A college student who always want to have fun.
• Have this very famous smile that make everyone fall for him.
• Would sometimes collaborate with Yunho's band.
• Behind his smiles are heartaches.
• He is an illigitimate son of a businessman.
• He believes that a smile can always make us get by.

 Shim Changmin "Max"

• Jaejoong's bestfriend together with Yunho.
• Works as a singer so college life has been a bit tough for him.
• One of the few people who can't be charmed by Jaejoong's smile.
• Their trio is very famous in their school.

   Lee Yunho

• Jaejoong's bestfriend together with Changmin.
• He is a vocalist of a local band called Sawdust.
• One of the few people who can't be charmed by Jaejoong's smile.
• Their trio is very famous in their school.

 Lee Sunkyu

•  Yunho's little sister.
•  Hates his brother for being famous in school.
•  Doesn't talk to his brother when they're at school.
•  Doesn't get along with Changmin that well.
•  A loner.