Changning is pure and sincere, but was born with prosopagnosia. Because of the iron rule in the immortal realm that women must marry by eighteen, otherwise facing forced arranged marriage and the eternal loss of freedom, she sets out alone on a journey to find her husband, intending to find Yunshu, the chief deacon of the Wanling Sect, to fulfill their engagement. Unexpectedly, due to her facial blindness, she mistakes the Demon Lord Youjue for her fiancé. Knowing full well that Changning has mistaken his identity, Youjue keeps her by his side out of an old grudge against Yunshu. Spending days and nights together, feelings naturally grow between the two. Ultimately choosing between sincerity and fame, Changning maintains the mistake and chooses to stay together with the Demon Lord Youjue for the rest of their lives.