Marriage life can be tough, especially when both spouses are unaware that the other is a spy. Felicity and Seungcheol have been married for over 5 years, but recently somethings been going on. Felicity is getting suspicious of what Seungcheol is doing and Seungcheol thinks Felicity is cheating. What will happen to them. With their love still strong they make it through and sort things out. But they're in danger from being killed. Deaths, fights and kidnappings all find their way into the couples lives, will they survive? (Based off the movie Mr and Mrs Smith)