The K2

Kim Je-ha is a former mercenary soldier for the PMC Blackstone. While in Iraq, Je-ha gets framed for the murder of his lover Raniya, a civilian, and becomes a fugitive. Je-ha escapes and returns to South Korea, where he is offered work as a bodyguard by Choi Yoo-jin, the owner of JSS Security Company and wife of presidential candidate Jang Se-joon. Je-ha accepts the job in exchange for resources that he needs to exact revenge on another presidential candidate Park Kwan-soo, who previously ordered Raniya's killing. Je-ha is assigned to guard Go An-na, Jang Se-joon's secret daughter, as An-na's life is always threatened because of her stepmother Yoo-jin. An-na, who has been a recluse and lonely all her life, starts relying on Je-ha, who shows concern for her and protects her everytime. They slowly fall in love, causing Je-ha to be torn between having to work with his boss Yoo-jin to exact revenge on Park Kwan-soo and protecting An-na against the wishes of Yoo-jin. Another key figure is Choi Sung-won, Choi Yoo-jin's half brother and the son of her father's mistress and eventual second wife, who is his half-sister's fierce rival. Plotting with Park Kwan-soo, Sung-won eventually causes the deaths of Jang Se-joon and Choi Yoo-jin but later pays for this with his life at the hands of Choi Yoo-jin's devoted assistant Kim Dong-mi. Park hangs himself for his atrocious acts and Je-ha finally proves his innocence and achieves his goal of revenge. Je-ha and An-na leave for a foreign country and embrace each other. An-na asks Je-ha about his real name and Je-ha reveals his name.