Cheong-ho is a national swim team member who isn't performing well. However, as an alpha, his physical condition can improve greatly through sex with an omega. Problem is, he is fearful of omega pheromones. His hopes of being a top swimmer sink, 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 it is almost like they’re a match made in heaven.