Lee Jun-suk (Joo Sang-wook), who has a rough life, was born in a civilian family. He has a seriously ill grandmother who needs to be taken care of. In high school, he is bullied by Kang Chang-sik (Yang Dong-geun), who is outstanding in academic background and popularity. He swallowed his anger and silently followed Chang-sik's instructions to do all kinds of annoying things. However, Chang-sik and others had no intention of stopping. They intensified and cruelly insulted Jun-suk's girlfriend Yoon So-eun, causing the girl to commit suicide. Over the years, Jun-suk, who was alone, has been looking for jobs everywhere and his life is in embarrassment. On an unexpected day, he met Chang-sik again, who caused the tragedy of his life. At this moment, Chang-sik has become an executive of a real estate company with the help of his father's background, and is dating the beautiful female doctor Ji-hee (Lee So-lin). Jun-suk, who has nothing to lose, launched a revenge action against Chang-sik...