Game in the Tomb: I Was Pulled into the Protagonist's Group Chat

[Do you want to prove that you are not crazy? In the mental ward, Li Yu thought he was really crazy when he saw the system pop-up window in front of him. [Do you want to prove to others those giant cities, extraordinary abilities, old curses, and life-and-death games you talk about? "So what if it proves true or false? No one cares, and I don't care either." Li Yu sat up, put one hand on his thigh and knee, and spoke nonchalantly. Do you want to see her again? "How do you prove that she existed? There is no trace of her in this world!" Li Yu's emotions had ups and downs, and things that had been completely wiped out in his heart were resurrecting. But the system pop-up window did not reply to him, as if the program had been programmed long ago, and he was sure that he would take the bait. [Come and participate in this brand new game, everything you want is in it] The system pop-up window disappeared and the door to the ward suddenly opened.