Tian Yi is a famous detained student in heaven, because his trouble in the past life has not been solved, he can only be a fairy in the fairy library. Once he unintentionally releases the imprisoned Snow Siren, he loses the magic as a mortal person to circumvent with the siren, but unintentionally falls in love with her. He knows that his previous mistakes led her to becoming a siren, so he voluntarily walks on the Death Road for thousands of years. Finally, in order to save Tian Yi, Snow Siren sacrifices herself....