Ro Sa gets suddenly pulled from all duties at the 24-Hour Health Club, shocking staff and members alike. While rumors swirl about her departure, she's pushed toward competing in the "Nabbi Women's Fitness Championship," ready or not. Meanwhile, tensions rise as Hyun Joong's over-the-top training gets her injured, and Mi Ran escapes to the gym to avoid her mother.

Mi Ran breaks the treadmill at the gym, so Hyun Joong starts offering personal training himself to make more money to get a new treadmill. Sung Im signs up for the PT session with Hyun Joong, and she starts pestering him all the time. Later, Hyun Joong finds out the reason why Sung Im had to stay at the gym all the time. Meanwhile, Mi Ran breaks down after seeing a glimpse of her ex.