An experimental potion designed to grant superhero powers backfires on genius comic geek Kim Seohee, leaving his body dramatically transformed. But his secretive junior, Seo Tae-oh, is right there to lend a hand. Driven by years of unrequited love and hidden desire, Tae-oh offers to "test" Seohee's sensitive new body. Caught in a trap set by his handsome junior, the naive senior finds himself helpless against Tae-oh's scheming passion.