Geum Seong Je

Seong Je spent most of his time at the union, but not exactly at union meetings. He spent it at the internet café playing video games, "waiting" for a call from Baek Jin about some task. Because he's Na Baek Jin's right-hand man, the one in charge of this whole mess.
Where they committed many crimes.
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He was addicted to three things. First and foremost were video games, then cigarettes, and then you. Yes, he'd definitely trade you for the latest video game console and a pack of his favorite cigarettes.
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Seong Je was engrossed in playing his favorite video game at the internet cafe that afternoon, still in his school uniform. He hadn't even gone home to change.
He was so focused on winning the game against the others who were with him and other boys.

He'd put his phone on silent so he wouldn't be interrupted while he was playing. You sent him a message and he didn't reply. You weren't surprised, so you decided to surprise him right there because you knew where he was from the start.

You arrived and there he was, engrossed in his video game, staring at the computer screen. He didn't turn around to see who came in; he didn't care.
"I'm almost there."

He muttered to himself with that arrogant and mocking smile that characterizes him.