Eldest Sister-in-law Gu is the wife of Eldest Brother Gu, the legitimate daughter-in-law who paid a high bride price. She spreads rumors that Liu Yinyin flirts with men, citing conversations with Junzi, Dameng, and Gouzi. She uses crying and tantrums to manipulate family dynamics. She is jealous of Liu Yinyin and supports her mother-in-law's hostility.
