Princess Yue Changge, to protect her younger brother's throne, confronts powerful ministers and leads her army into battle. Upon her victorious return, she is betrayed and her cousin, Fu Qingluan, is mistakenly killed because of their resemblance. On her deathbed, Fu Qingluan tells Yue Changge that she has been mistreated in her husband's family and begs her to avenge her and care for her daughter. Yue Changge returns as her cousin, fulfilling her cousin's dying wish while uncovering a conspiracy at court. She and Yun Chuxu, whose engagement was broken off due to a misunderstanding, go from initial testing to joining forces, ultimately defeating their enemies and finding happiness together.
