Despite his job as En's cleaner, Shin has a very easy-going personality and is rather approachable by all within the En family. He cares deeply for his partner, Noi, and the two share a close bond. Though Shin is seen to be rather modest around Noi, since he is often embarrassed by her displays of affection, he does return it on occasion. He does not kill without reason, though it doesn't seem to detract from his enjoyment of his job's brutal nature.