Which is why we see his stitches and everything. He’s some kind of mutant zombie. So he doesn’t care if he dies again cause he can’t. And teach has definitely tried killing him before (but likely forgot).
I think the teach trying to kill him is referencing the 'sleepwalking' when he's tried to so far kill guwon and himself ╥﹏╥
Which is why we see his stitches and everything. He’s some kind of mutant zombie. So he doesn’t care if he dies again cause he can’t. And teach has definitely tried killing him before (but likely forgot).