Shun Long's way involved the 'immortal-grade' cultivation techniques that Shun Long had given to Bai Longtian and the rest.
Of course, Liu Mei herself had no need to absorb qi, and she could naturally reach the peak of the Nascent Soul just by killing other cultivators and absorbing their energy.
However, Liu Mei had also found out that she couldn't do that too recklessly, or the negative effects of the 'Blood Absorption art' would probably start affecting her.
Thankfully, Shun Long was already prepared about this and wasn't planning to let Liu Mei be affected by the Blood Absorption art.
The melodious sound of a guqin would often fill the room, immediately expelling any negative emotions that tried to bubble inside Liu Mei along with the blood energy that she had absorbed and slowly influence her personality.