Yoo Hajin, who quickly earned recognition for his abilities at the global mercenary company 'Blackwater' and was selected as an elite operative, carried out covert missions around the world with the aim of raising funds to start his own business. At his wife's earnest plea for a normal life, he gave up starting a business with his friends and joined Daehong Group as a bodyguard. During a mission in Macau, he is tasked with handling the slush funds of Choi Joomyung, the chairman of Daehong Group. However, in the process, he is falsely accused of leaking corporate secrets. He is shot by his senior and colleague, Kang Woosung, and falls into the sea...