After logging out from Zombie Survival Online, Weiss returned to the real world.
Like the rest of the players, his main body was also sent to a separate dimension in the game world. It was to prevent others from harming his main body while his consciousness was in the game world.
Dying in the game world wouldn't cause real death since the consciousness was transferred to the player body while the player's real body was in a separate dimension.
Of course, if Weiss wanted to, he could also make his games a real death game by transferring the real body of a player in the game world instead of letting them use a player body.
However, that didn't make any sense to Weiss since his goal was to farm Dev points. If the players didn't experience true death while playing his games, then they would keep on playing his games just to obtain the rewards for winning the game.