"Mèng zhī Sēn" is an original duet song featuring Luo Tianyi and YANHE. This song tells about a child who had lost her mother, and also eventually lost her father to drinking problems, leaving her to beg on the streets. She fantasizes about a dreamy forest where she can be happy and experience love's warmth. In that fantasy is also another girl named Calamus, along with two other girls. This song has exceeded 100,000 views on bilibili.