What is the relationship between jade sandalwood and Ruoxi in Walking on Thin Ice? Sincerely right friend? Or use it directly? Who helped Yutan when she was a child?

Yutan and Ruoxi are good friends and sisters. Kangxi banished Ruoxi to Huan Yi, and Tan Yuer sent her there to help her take care of others. If Xi doesn't want to marry the prince, he deliberately throws cold water on it and doesn't take medicine. Tan Yu takes care of her illness. These are all sincere. When Yutan was a child, Jiu Ge gave her a lot of money, and she said she could die for him. Jiu Ge wants to get some information through Yutan. Even if Yu Tan doesn't want to cheat Ruoxi, he has a different position and sometimes uses it. Hand, hope to adopt.