Jiang Hong's mother was a concubine's daughter of the old master Lu. The old master Lu had four sons and daughters in total, and only Jiang Hong's mother was a daughter. Therefore, even if she was a concubine's daughter, she lived like a legitimate daughter.
The country guarding Duke was Jiang Hong's uncle, and Lu Zheng was her cousin.
Jiang Hong helped Lu Suan because she was used to listening to Lu Suan since she was a child. Lu Suan was the daughter of Duke Zhenguo and the biological granddaughter of Prime Minister Lin. His aunt was imperial concubine Lin. Back then, all the children of the Jiang family fawned over Lu Suan, and Lu Suan was only good friends with Jiang Hong.
Originally, after the Lin family collapsed, the Jiang family had deliberately asked Jiang Hong to have less contact with Lu ni. Otherwise, she would become an old daughter and would not be able to find her in-laws.