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“I’ll repay that 450 thousand for you…but in exchange, you’re mine.” Due to the debt left behind by his father, alpha Seo Taeyoon is at the mercy of Park Jae-in, a mob boss with a penchant for violence. But when Taeyoon is able to identify Jae-in as an omega by scent alone, the ruthless criminal is taken aback – because nobody should be able to smell his pheromones. Seeing this as his opportunity to regain what once was lost, Jae-in offers to pay off Taeyoon’s father’s loan in exchange for a life of servitude. Now Jae-in holds the key to both the physical and metaphorical locks around Taeyoon’s neck. And so begins their relationship as master and slave...but there's no telling how it will end.
Cheong-ho is a national swim team member who has been struggling with poor records. As an alpha, his physical condition could be improved greatly through sex with an omega, but he has a fear of omega pheromones. His hopes of being a top swimmer seem to be sinking, but that all changes when he meets Yi-rim, an omega whose pheromones don’t give off any scent. Yi-rim is only too happy to help Cheong-ho out, and thus the two of them start a purely physical relationship. It’s almost like they’re a match made in heaven. But…why is it so hard for them to close the distance between each other?