Actually you can try reading the novel.... The story there isnt confusinng... However, the novel isnt completely available as it isnt completely translated and released...but new translated chapters are being released everyday... U can read the novel at https://readnovelfull.com/godly-empress-doctor-v1.html
You asked how mu zhizhou her master fell asleep and powerless.... If u check the novel u will find that its because when feng wu was 8 yrs old she was stabbed in the heart by her rival and lost all her cultivation... He had to sacrifice his cultivation to keep feng wu alive and save her.... Due to which his soul git hurt and he fell into a deep sleep.
U can read the novel at
https://readnovelfull.com/godly-empress-doctor-v1.html
https://readnovelfull.com/my-disciple-died-yet-again-v1.html
This is the link for the novel version.