Kim Moo-yul

Kim Moo-yul (김무열) built his reputation the hard way: first through musical theatre, then through a run of screen performances that turned him into one of Korea's most reliable intensity merchants. Netflix is leaning on exactly that quality in Teach You a Lesson, where he leads the adaptation opposite Lee Sung-min and Jin Ki Joo. He does not play soft authority well. He plays pressure, moral abrasion, and men who look dangerous even when they stay quiet.

That screen identity did not arrive overnight. Kim first broke wider with War of the Arrows and A Muse, then kept widening his lane through projects like Forgotten, The Gangster, the Cop, the Devil, Juvenile Justice, and the later Sweet Home seasons. The throughline is control. He can land genre material without flattening it into simple toughness, which is why his casting in another anger-driven adaptation of a WEBTOON property feels commercially sharp.

His 2026 slate keeps that momentum intact. Teach You a Lesson gives him a headline Netflix role with built-in controversy and obvious global curiosity, while his recent film run has kept him visible to both mainstream audiences and heavier cinephile crowds. He has become the kind of actor who raises the floor of a project the moment his name enters the billing.