Bai Qingya hesitated after listening about the heavenly oath. She wanted to stay free from all kinds of restrictions and a heavenly oath is one of the strongest ones.
Lin Feng saw through her thoughts and also understood how she would not like being bound by an oath, so he decided to give her a leeway, "Senior Bai, you do not have to take a permanent oath, a few decades would do."
Lin Feng had met his grandmother recently and she was recovering but it would still take quite a lot of time.
Once he began walking the path of Dao, he might be able to influence it a little, but even with that it would take a lot of time. Still, he was also sure that she would heal herself enough to live normally in a few decades.
