Joon Seok had a miserable time during his high school days, constantly being bullied by Chang Shik. The torment he endured left deep emotional scars, making it difficult for him to assimilate into normal life. Meanwhile, Chang Shik seemed to have completely forgotten the pain he inflicted on Joon Seok and was living a happy and fulfilled life. As Chang Shik prepared to marry Ji Hee, Joon Seok made up his mind to seek revenge for his past.