The Kang Clan is a family of very wealthy South Koreans that acquired their money through questionable means. No one knows how they came to their wealth, but no one bothers to question the powerful tycoons. It's still a mystery, but most believe the family makes up its own mob. Kang Minjoon was quite prominent in this world, older brother of Kang Taejong who seemed to have distanced himself for the "safer" route. Minjoon had always lived for risk of the dangerous life a majority of their family lived, so unlike Taejong, he plunged himself deeper into that life.
He met his future wife in a predicament that didn't come to light until a few years later. For the sake of peace long enough to re-negotiate territories, Park Joora and Kang Minjoon married. Even though they planned to split a year after, against all odds, they ended up falling in love and staying together. Joora wasn't a giant fan of the mob boss life that Minjoon lived, especially as she felt that she was constantly in danger. She tried to convince him to drop it but in the end, what really got him to try and turn over a new leaf was the news that she was to give birth to twins.
And then came the cuties! Hyungguk and Junhee came along! Growing up, it was clear from the start that the two lived in completely different worlds. Junhee was more inclined to the Kang tradition of mafia activity and Hyungguk was more inclined to, well, anything else. Because he was so different, his family started teasing him and calling him "Ponyboy" like from The Outsiders. Then it just kind of... stuck.
When Ponyboy was six, he came across cat in a tree. He could've easily helped it down if said tree wasn't on fire. Panicked and with no one around, Ponyboy took one look at the fire hydrant before it exploded. The water doused the fire and some firemen showed up soon after to get the cat down. Needless to say, he kept the cat.
At age seven, Ponyboy started at Mahoutokoro with Junhee. Though they were in completely different friend groups, Ponyboy still stayed close to his brother. He loved Junhee more than anything in the world. And he makes sure to remind him overtime he sees him. In school, Ponyboy found some friends who liked to dance and they formed a sort of crew - called themselves Singularity. They'd just dance for fun, but they were all actually good at it.
After graduation, Ponyboy and Singularity started doing charity concerts. They'd dance to raise funds for local places and families in need. When Ponyboy wasn't doing that, he was still doing some form of charity work for those less fortunate. He'd spend his days at nursing homes or taking care of animals - whatever he could do to help. And that's how it's been. Ponyboy still doesn't know what he wants to do with his life, but for now, he's doing the best he can.