Do-hun lies desperately on the airport floor to prevent his wife Yu-ra from going on a 10th wedding anniversary trip alone. With no hesitation, Yu-ra passes Do-hun and takes a plane to Vietnam. The only fault Do-hun has was that he is busy. Not busy, but too busy. However, as he can't reveal his real status as an ace agent who tracks high-grade criminals, Do-hun has no choice but to apologize and act charmingly to Yu-ra. Meanwhile, his agency offers a new mission to chase a member of the notorious crime syndicate. However, without having a chance to leave the last word, he gets shot by someone anonymous. Who killed him?