Park Hyung Suk, a perpetual target of bullying due to his short, overweight, and unattractive appearance, decides to flee his tormentor, Lee Tae Sung, by enrolling in Seoul's Jae Won High School. However, on the brink of this new beginning, he awakens to a miraculous transformation: his once undesirable physique has been replaced with a tall, handsome, and fit body. The catch? Hyung Suk now alternates between his two starkly different bodies, each awakening when the other sleeps. As he grapples with his newfound popularity at J High, he also delves into the mystery behind his extraordinary second form.