After choosing to leave, they regretted it.

Good news: You have traveled through time, this is your plug-in, these are your teammates, go and defeat the devil.
Bad news: Cheats are bad, teammates are crappy, only enemies are real.
He has to do all the dirty and tiring work, work like a 007 until he vomits blood, and also be subjected to all kinds of scolding, humiliation, and PUA.
After working so hard and being seriously injured, he didn't get a single good word in return. Instead, he had to be scolded and take the blame. Aize finally couldn't bear it anymore.
"Yes, I am weak, I am unworthy,...