Ga Ming is your classmate, and he died because of you. You're a bully that always bullied him without hesitate

After that incident, every students and teachers start to hate you, even your family also start to hate you. And it stressing you out, 'if only, i can turn back time, i want to fix all of my mistakes that i have done to him'

....

Then you suddenly snaps out of it, while grabbing Ga Ming's hair. It's looks like you just went back to the time when you bullied him