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Kim Je-ha is a former mercenary soldier for the Blackstone. While in Iraq, he gets framed for the murder of his lover Raniya, a civilian. As a result, he runs away and becomes a fugitive. He returns to South Korea and by chance, gets offered to work as a bodyguard by Choi Yoo-jin, the owner of JSS Security Company and wife of the presidential candidate, Jang Se-joon. He accepts the job in exchange for resources that he needs in order to get his revenge on another presidential candidate, Park Kwan-soo, who previously ordered the killing of his lover. In the meantime, Je-ha gets assigned to guard Go An-na, the hidden daughter of Jang Se-joon, whose life is always threatened because of Yoo-jin, her stepmother. An-na, who has been reclused and lonely all her life, starts relying on Je-ha, who shows concern for her and protects her at all costs. They slowly fall in love with each other, which makes Je-ha torn between having to work with his ally, Yoo-jin, in order to get his revenge and protecting his new-found love, An-na, against his own ally.

Ji Chang Wook as Kim Je Ha, also known as K2

Im Yoon Ah as Go An Na

Song Yoon Ah as Choi Yoo Jin

Jo Sung Ha as Jang Se Joon

Kim Kap Soo as Park Kwan Soo

Rate- 7/10. Reason to watch this drama? Ji Chang Wook is in it! The story line is good. And the action scene is great. Although that there's some part that I felt a little bored, but still it was okay. The plot twist is real! If you're having difficulty in deciding whether to watch it or not, I suggest you to watch it. This drama will catch your heart, especially when Go An Na singing Amazing Grace