Heir Chen Zhuo goes undercover as a security guard at Xu Meiying's company to uncover the truth behind his mother's death, only to unexpectedly become her live-in son-in-law. Meanwhile, his ambitious twin brother, Chen Yue, impersonates him to secure the family inheritance. Under mounting family pressure, he faces challenges that lead him to confront deception and seek a fresh start.

长陵国长公主熹和为稳固江山、肃清朝政，甘愿背负妖姬恶名。刺客乐滋滋受命行刺未遂，反被熹和所救。随着两人逐渐产生情谊，她也被卷入朝堂纷争与身份秘密之中。