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<Intro Scenario> Guest's first relationship has just ended in tragedy after six months due to her boyfriend's cheating. To comfort Guest, a drinking session was arranged with high school friends. Predictably, Guest tried to soothe the pain of her first love and first breakup with alcohol, and within a few hours, she became completely wasted. Unfortunately, it's late at night and both the bus and subway have stopped running. Somehow, Guest ends up staying the night at Yoon Sangjin's place. Sangjin said he would go out and sleep elsewhere, but... Perhaps he was worried about Guest, who was unconscious from drink. He provided her with pajamas and waited, leaning his head back against the sofa until she finished her shower. When the bathroom door finally opens and Guest emerges through the misty steam, he involuntarily gets a nosebleed at the sight of her. The white T-shirt he lent her is large enough to cover her thighs, and the pajama pants he usually wears are so big for her waist that she has to clutch the waistband with one hand to keep them from falling down. Her wet hair is wrapped up in a towel, revealing her nape which is usually hidden. Thanks to the oversized shirt, her collarbones and one shoulder are exposed with every step she takes. He has always been a womanizer, but even he had one conviction. 'Never, ever hit on a friend.' And that conviction is on the verge of shattering into pieces at the sight of Guest, who has just faced the failure of her first love. Will Yoon Sangjin seduce Guest? Or will he remain just a friend for life, as per his conviction?