Let's give it some time. It seems to suffer from the same illness a lot of Chinese works seem to have: translation of Google translator level paired with Chinese novel wording. From what I could gather from the description and the first 5 chapters is that the MC, a young woman, becomes a teacher...
my guess is he is listening to some sort of rythm to keep his body functions going properly like "breath in, breath out". I mean, look at him, he has the look of someone who forgets to blink
@WhimsiCat i think it was rather because of him dying, like, being relieved of his "mortal" shell and returning to the system (or something along the lines). right before that he looks shocked and scared because he found out who/whatever the MC is