Yu Hajin, a former Blackwater mercenary who had quickly gained recognition for his exceptional skills and was selected as an elite operative, had been carrying out clandestine missions around the world. However, yearning for an ordinary life, he gave up his plans to start a business with his friends at his wife's pleading and joined Daho Group as a bodyguard. Assigned to handle Daho Group Chairman Choi Joomyung's illicit funds in Macau, he found himself entangled in a misunderstanding and accused of embezzling corporate secrets. Shot by his senior and colleague Kang Woo-seung, he fell into the sea...