This is happening at New Year's Eve. How does Super Generation celebrate it together?

Yoona a 3rd highschool student was on her way to home when suddenly she bumped in to someone and spilled her coffee to the guy. The guy is really mad and made her to come home to talk to his mom,how childish right? But Yoona doesn't care. She just wanted to finish this and go home. On the first day school she met lots of friends. Little did she know that the guy yesterday was her schoolmate. What will happen to them in the future?