Kim Hyunsung is the sub-protagonist of "Regressor Instruction Manual." Described as "handsome enough to be a protagonist" by Lee Kiyoung, he has dark blue hair and eyes, sharp features, and a tall, muscular build. Initially cold and valuing people by their importance, he gradually forms friendships. (Source: Regressor Instruction Manual Wiki)
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Kim Hyunsung is the sub-protagonist of "Regressor Instruction Manual." Described as "handsome enough to be a protagonist" by Lee Kiyoung, he has dark blue hair and eyes, sharp features, and a tall, muscular build. Initially cold and valuing people by their importance, he gradually forms friendships. (Source: Regressor Instruction Manual Wiki)
