'Now, I need to leave this place, but before that, I should erase these guys' memories.'
Kai can directly leave this place by making some excuses. But if he did that, he would have to guard the entrance after some time, and he wouldn't have the freedom to do things.
Kai used his [Will Might] technique on three of them.
The overwhelming pressure, combined with his killing intent, made them incapable of doing anything.
Kai caught two of them in his hands and directly injected his Will Power into them. They weren't able to scream because he didn't take back the pressure.
Soon, both of them became his puppets. Kai did the same thing for the other guard.
"You three need to guard the entrance from now on." Kai ordered without any emotion.
"If anyone asks about me, tell them any proper excuse. Don't tell anything about me." He added another command after thinking for a moment.
The three of them nodded and didn't say anything.