2 friends (Luka and Qi Yang) go to university together after high school. They both go on with their own lives and find themselves girlfriends. Both of them agrees that they'll still compete for their marks as before.
Luka's girlfriend doesn't let him play football with his friends. She also doesn't let him go out for group studies with his friends.
I've got the notes. Meet me at 8 tonight with the cash
Luka's girlfriend snatches his homework away from him when he's doing it.
On the other hand, Qi Yang's girlfriend allows him to go out with his friends and lets him relax from time to time.
Once Qi Yang is away, she goes through his notes from school and texts her client that she's got the notes and asks the client to meet up that night with the money. (Many people knew Qi Yang was a hardworking student who made his won notes who were of standard so others really wanted them)
Qi Yang found out his notes were stolen and accused Luka for stealing them as he thought Luka was trying to set him up so Luka could beat him in the exams.