“I regretted all my decisions in life.” After serving 10-year prison sentence, Su-hyuk learns that he has a daughter and decides to leave the syndicate he called home to live a normal life. Boss Eung-kook, who had been waiting for Su-hyuk’s release, feels betrayed and orders his second-in-command, Kang, to keep an eye on him. Filled with a sense of inferiority towards Su-hyuk, Kang approaches the duo of assassins known as Woo-jin  and Jin-ah, nicknamed ‘The Washer’, to eliminate Su-hyuk. These merciless assassins handle their targets in their own brutal ways, and they get closer to killing Su-hyuk… A normal life becomes the most dangerous dream.