Character Arc
Lee Dong-sik is a veteran officer assigned to the small Manyang substation, a man whose easy smile and offbeat manner mask a long history with the town's unresolved tragedies. Once a promising detective, he has spent years quietly tending to his rural community while carrying the weight of a disappearance that touched him personally. Many neighbors regard him with a mix of affection and unease, and a persistent thread of suspicion follows him wherever he goes.
Across the series, Dong-sik becomes the central puzzle: it is rarely clear whether his deflection is the habit of a grieving, misunderstood man or the careful cover of someone with secrets to keep. He responds to his new partner's scrutiny with a maddening calm, alternately disarming and provoking Han Joo-won, and the show uses their exchanges to explore guilt, reputation, and the cost of being judged by a community that has already made up its mind.
His arc is ultimately a study in moral ambiguity rather than simple guilt or innocence. As old cases and new ones converge, Dong-sik's choices force both Joo-won and the audience to weigh how grief and obsession can blur the line between justice and vengeance. The role is widely regarded as one of Shin Ha-kyun's finest, anchoring the drama's tension with restraint.