While K-drama leads often operate within the confines of clearly defined moral boundaries—heroes as lovers, saviors, protectors, and caretakers—villains are afforded far greater freedom. Over the years, there has also been a rise in the anti-hero characters who dwell in moral grey zones, more layered and intriguingly written, straddling the line between protagonist and antagonist. Here, we list six iconic villains who embody this unique, unforgettable energy.