FLASHBACK (Kim Taehyung)

Year 2010, a young boy was seen almost lifeless at Nalmoe Village's (Bisan-dong) wet market, located at Daegu one of administrative division of Gyeongsang Province. Flock of villagers were horrified, faces were accompanied with unanswered questions. Nobody knows what happened. A woman in her 50's rushed over at the scene of the crime, worn out but still manage to scurried to the boy's weak body. She cried and asked for help, a certain distance, the defeaning sound of ambulance siren was heard, after a couple of minutes, nurses went to assist the boy and was rushed to the nearby hospital. Fast-forward, current date and time. A young man in his 20's was seen at the same location where a violent scene happened 10 years ago. His eyes were cold and dead. He was there, just standing. "Fuck, flashbacks" he muttered under his breath.

What did exactly happened 10 years ago?