C74 Weapon Exchange in the Stone Age

"System, can you open the front door?" At this moment, Qin Guan was talking to his brain.

Wasn't his System supposed to be used to exchange equipment from the cemetery? Right now, he had entered a real graveyard.

If he wanted to play a secret chamber escape game, he would need to find a secret key or something. Qin Guan really had no interest in that. His brain was not like this