Younger sister of Lan Yuchu and the daughter of Lan Huaixi and Qian Xiuying. She is in school and usually returns home late. She has a lukewarm relationship with Lin Qiyue and does not get along with her eldest sister-in-law either. The eldest brother works at a factory and is always arguing with his wife, often not coming home. Lan Yusui is the one who demanded that Lin Qiyue hand over all her wages and the money Lan Yuchu sent home, claiming it was for her nephew's critical growing stage. She is pregnant again and overwhelmed with a baby to care for.
