Hae-jo is the heart of Mr. Plankton, a charming, restless drifter who has carried the feeling of being unwanted since childhood. When he learns that his birth was the result of a mistake and that he is also dying, the two revelations collide and send him on a journey to understand where he came from and whether his life ever counted for anything.
Much of his arc plays out on the road alongside Jo Jae-mi, the woman he was once engaged to. Their reunion is prickly and funny at first, but as the trip unfolds, Hae-jo's bravado gives way to vulnerability, and the comedy gradually deepens into a tender meditation on mortality, regret, and the wish to be remembered.
By the end of his story, Hae-jo's search for his origins becomes less about blame and more about connection. The series treats his terminal illness with dignity and warmth, letting him find meaning not in grand gestures but in the small, human moments he shares with the people who choose to stay beside him.
Hae-jo is one of the central figures in Mr. Plankton, a drama/comedy/romance/korean/road-trip series that aired on Netflix from 2024. Within the narrative of Mr. Plankton, Hae-jo serves as a pivotal character whose decisions and relationships drive key story arcs throughout Season 1. The character's journey has been central to many of the show's most memorable and discussed moments.
Portrayed by Woo Do-hwan, Hae-jo has become one of the most recognizable characters in modern television. Woo Do-hwan's performance brings nuance and depth to the role, creating a character that resonates with audiences on both intellectual and emotional levels. Woo Do-hwan's work has been recognized with 2 major awards, reflecting the critical acclaim their portrayal has received.
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? Frequently Asked Questions
Hae-jo is played by South Korean actor Woo Do-hwan, who leads the series as the dying drifter at the center of its road-trip story.
Hae-jo learns he was born by mistake and is terminally ill, then embarks on a final journey to find his origins and reconnect with his ex-fiancee Jo Jae-mi. His arc is handled with warmth, focusing on his search for meaning and connection rather than despair.
