On the day of her wedding, Li Qingyue, the young sect master of Lingyun Sect, is abandoned by her fiancé, Song Minglang, who runs off to be with his childhood sweetheart, Zhang Yu. To preserve her sect's dignity, she turns to her sworn rival, Mu Li, the master of Cangqiong Pavilion, and enters into a temporary marriage pact with him. Mu Li has secretly loved her for seven years and protects his wife fiercely after their marriage, supporting her and paving the way for her success at every turn. Song Minglang and Zhang Yu, resentful and unwilling to accept defeat, join forces to frame the couple, only to fall into their trap and ruin their own reputations. As Li Qingyue gradually falls for Mu Li and discovers the deep feelings he has concealed for years, the two formally establish a Heavenly Dao marriage pact and walk the path to immortality side by side as equally matched partners.