Teng Zhao was willing to become Qin Liuxi's disciple, and although his father Teng Tianhan was reluctant, he finally let go but insisted on taking his son to Li City.
Teng Tianhan understood that this might be the last opportunity for a warm father-son moment, as once in Li City, it would likely be a long time before he could see Teng Zhao again.
Qin Liuxi saw Teng Tianhan's insistence and did not refuse, after all, she had taken away someone's son, she could hardly deny this request.
It was just becoming her disciple, not severing all mortal ties.
Since Teng Tianhan insisted on accompanying him, it wasn't a simple matter of just setting off; all necessary preparations had to be made, including arrangements for people and more importantly, gathering Teng Zhao's personal belongings.