Na Baek-jin lived with his abusive stepfather while his mother was hospitalized and on life support. He attended Yeowon Elementary School where he was given a grant due to having a parent on life support and being a working student. Baek-jin was often bullied by his classmates for being poor and his teachers took advantage of him being a working student by having him do non-school related tasks such as massaging their feet. Everything changed when Baek-jin's mother passed away in the hospital and he wasn't aware of it at the time as his teachers kept it from him to keep him working at the school for them.
After the realization of his mother's death finally reached him, Baek-jin became overcome with grief. His bullies who tormented him throughout the school years made the mistake of mocking his mother's memory and destroying the notes she had left him, which were the only things Baek-jin had left of his mother. No longer feeling he needs to hold back, Baek-jin brutally beat the hell out of his bullies, who immediately began screaming for mercy, proving they were nothing but self-entitled cowards. Afterwards, he got physically berated by his corrupt homeroom teacher for the act, calling him "ungrateful for all the things he did for Baek-jin" (which included giving him moldy bread to eat) before having him expelled. Baek-jin then threatened him back, saying that his actions taught him how disgusting adults are and decided to take that lesson to heart.
Three years later, after Baek-jin began establishing the Union, he hunted down and beat up his abusive stepfather who had abandoned him after his mother's death and had ran off with the life insurance money. Afterwards, he left him to his fate after reporting his location to people he owed massive debts to. Baek-jin also paid back his corrupt homeroom teacher by exposing all the dirt he collected on him on the day before he was planning to get married, which included taking bribes, school corruption, sleeping with other women (including some students' mothers), and sexually assaulting female students. He then later gets his gang to ambush and beat up the homeroom teacher for good measure.
Baek-jin realized that in order to properly manage students, he'd also need to be a student and enrolled into Yeo-Il Middle School in the middle of the second semester. He blackmailed the principal into making his attendance in classes not mandatory. Kingsley, at first, thought Baek-jin to be a typical thug that solved everything with only violence. However, Baek-jin proved Kingsley wrong by beating a third year bully with connections to the school, yet getting the bully punished with a transfer to another school while he himself got away with a light sentence of volunteer hours. Kingsley considered Baek-jin to be the perfect being he had always idolized and became his loyal follower.
He quickly rose in notoriety for being a powerful leader that unified the middle schools in his districts. Manwol ignored this rising star and that proved to be their fatal mistake, as Baek-jin and his gang took down Manwol while they were still in their third year of middle school and established the Yeongdeungpo Union, with Baek-jin as their leader.
