The hero is a foreign trade businessman on the surface, but he is actually an underground arms dealer. The hero has a fiancée who is a business marriage. The heroine goes undercover as his fiancée's bodyguard for revenge. The first meeting between the two was not pleasant. They fought each other and tested each other's identities. After several exchanges, the two reached a deal and each got what they wanted. The heroine is beautiful and intelligent, and the hero is brave and resourceful. The two are attracted to each other, and the hero falls deeper and deeper, but the heroine keeps wavering for revenge until the hero sets up a trap, and the conflict is about to break out...