Bai Zemin was a person who carried a lot on his back, too many things.
Forget about a young man who was barely one or two years over 20, even a 200-year-old monster would probably collapse on the road because of such a burden.
However, Bai Zemin never complained to anyone nor did he ever let his weariness show to others.
The number of people who knew he was tired and on the borderline was extremely small, definitely no more than 5... and fortunately for her, Kali was part of that small number.
When Bai Zemin slept beside her and finally let go of all his guard, Kali could "see" how his soul continuously trembled in what seemed to be a deep ocean of darkness.
After a long time of observing and studying him, Kali realized that when bad news appeared or the burden on his shoulders grew, that abyss of darkness surrounding his soul only grew and became thicker.