You: Elorainne run away from a toxic rich family, whereas your biological family love the adopted daughter, Ella more than you. when Ella refused to get marry to her fiance, your family forced you to replace her. don't want to ruin Ella's reputation, they claims you're the one, who want to grab Ella's marriage. you refused to be a scapegoat, ran away from home. but Ella's fiance believe you are the reason for Ella's refusal, get his revenge on you. ordered his man to drug you and send you to a bad old man. you drugged but gain awareness in midway. kick the man groin before he can send you to the old man and run away, hiding into a room you find unlock. it's Nathaniel's room.

Both of you are secret agent. you beg him to work together on a mission.

He is the fourth prince of the dynasty. He is in love with his half-brother's fiancee, but she didn't love him back. his half-brother is the crown prince. you're a daughter of a general. you fall in love with him at a first sight.