A black-hearted beast should not to be taken lightly. Song San fell in love with Lee Hee-min, a stranger who took him in and cared for him when he was small. Once he became an adult, San confessed his feelings to Hee-min and was going to distance himself only to find out that Hee-min easily accepted his feelings! "Why did you accept my confession, mister..??!" A cheerful and warm love story of a naive black-haired beast!