Hyun-soo, a humble fitness trainer, ranks last in sales in his later years. On the other hand, Dong-jun team leader is always number 1 in sales due to his intensive business skills and active touch. So one day Hyun-soo's friend Sang-mi checks into Hyun-soo's gym. Hyun-soo is trying to stop Dong-jun, who is after Sang-mi.