Du Ziyuan, played by Guo Jiaming, and his sister Lin Changying (played by Lan Xi) have been childhood sweethearts since they were young. Later, they were separated due to the war and the mission of our party. Many years later, Du Ziyuan met "Lin Changying" whom he loved in his childhood again, but he didn't know that she was Lin Changying's twin sister Su Shaoqing (played by Lan Xi). When he found out that this person was not the other person, Du Ziyuan and Su Shaoqing had already started a new relationship. The romantic and suave Du Ziyuan originally loved his sister Lin Changying wholeheartedly. The scene of reunion often appeared in his mind. Perhaps it was because of the torture of thinking about her day and night, or perhaps it was because of the passion that he hadn't seen for a long time, but he "loved the wrong person" by mistake. The two sisters started a battle to return their identity and return their love.