A quiet guy who works as a maki-e lacquerware artist by day—the kind of craftsman who can make ornate gold designs on wooden surfaces look effortless. But that's just his cover. He actually runs Ribenjiya, basically a revenge-for-hire operation (the name's a playful corruption of the word "revenge"), where he takes on jobs from people who can't otherwise afford to settle their blood debts.
His method is distinctive and unsettling: he suffocates victims by slapping sheets of gold lacquer over their faces. There's an obvious irony there—the same beautiful material he works with professionally becomes a tool for killing.
Yuen's religious faith runs deep. He's got a massive tattoo of the Virgin Mary covering his entire back, which ties into his involvement with an underground Christian group. For him, the faith and the killing aren't separate worlds—they're part of the same commitment he's made, however twisted that might seem from the outside.
He comes across as soft-spoken, even gentle. The kind of person you'd never suspect of anything, which is probably the whole point.
Content compiled by AnimeList.moe from publicly available sources.