"The 600 million that was left to you, i'll pay it off for you." Seo Taeyoon, who was dragged into the situation because of his father's debt, got angry and sneers at Park Jaein for being an omega after the latter made a sarcastic remark. Although Taeyoon detected Jaein's faint pheromone scent, he was able to identify him as an Omega. Jaein found Taeyoon interesting, so he offered to pay off his debt in exchange for buying him...! Thus, Taeyoon now wears a leash designed for dogs. How would their dangerous relationship begin and end?