"Guan Guan Jiu Jiu, in the River Island", "Green Zi Jin, lingering in my heart", "The moon rises brightly, and the outstanding people are here"... What kind of stories are hidden behind these love songs that have spanned thousands of years and still exude charming splendor? What kind of thoughts do they convey? A sickly literary girl spends the last year of her life making a deal with a narcissistic fox demon man. As long as the fox demon agrees to accompany her on a trip, the girl's soul will completely belong to him in a year. The two traveled back in time to the Book of Songs, and the girl transformed into a poetry collector and traveled around the world, collecting folk songs to appreciate the ancient Chinese cultural customs, and at the same time unearthed the stories behind the love songs. At the same time, the girl and the fox demon also developed an ambiguous relationship. A year later, the two traveled back in time. Will the girl whose wish comes true die? How will their love affair end?