In fact, without the old lady reminding them, Zhang Biaotou and his brothers have already thought this way. Their lives were supposed to belong to Yama, it was the young lady who extended a helping hand, so they could be reborn and reunite with their old mother and their wives and children. Henceforth, their lives belong to the young lady.
Once they have his promise, Cai Wei entrusted Chun Liu, Zhao Yun, and Aunt Liu to them, instructed them to sell the family property as quickly as possible. Once Aunt Liu's waist recovers, they will find them in the capital together.
Cai Wei didn't tell Nangong Yi that she was going to leave. She only wrote a short letter and asked Zhao Yun to deliver it to Manager Li tomorrow.
In the letter, she informed him that she had found the whereabouts of her family, was going to rescue them, could not make time to bid him farewell, and would hence take leave first.