Bodyguard (2003)

Since Kyung-tak was forced to resign from his military post due to the fault of his superior, he is jobless and tries to make a living helping out at his parents' restaurant. As luck would have it, while applying for a new job, he saves a client of Yoo-jin's, a bodyguard, which results in Kyung-tak becoming employed by the security firm where she works, which is run by Sung-soo. Kyung-tak's life is headed for further changes as Na-young moves into town with her grandmother and becomes friends with his younger sister Kyung-mi.