An addiction to killing teammates is a disease that needs to be treated

Scarlet Pupil blinked in slight confusion. For some reason, after having brought the topic of death up, the mister in front of him suddenly became very active.

What did Mister mean when he said that nobody among his peers is more experienced in death than he is? I keep on getting the feeling that something doesn't sound right... Why does it sound like Mister dies quite often?

"Speaking of death, I cannot not mention my first experience with death. That was also when I died the most times over a short period of time. Although it wasn't that long ago, it feels like it's been ages since then," Song Shuhang said while reminiscing. 

"!!!" Scarlet Pupil. 

First experience? Is there even a second experience when it comes to something like death?