21-year-old Jang AnChul has been on a fast track to success with his MMA career blossoming and setting up a phone store on the side. Kim JinWoo, his classmate whom Anchul had bullied 3 years ago in high school and had ruined his life, places a curse on him upon death to make Jang AnChul turn into Kim JinWoo 3 years ago as revenge. Now placed into a bullied classmate’s body 3 years ago, Jang AnChul, to undo the curse, is tasked with stopping 4 “Life Completely Ruined” incidents as well as rehabilitating his past self. How will he navigate his way through his past self and his cronies’ torments?