Those several white coats were shouting, Han Xiao hadn't heard their language before, but he could understand the meaning. "Experiment", "survival time", "guard" these words made him feel uneasy. Footsteps sounded urgently outside the door, someone was quickly approaching.,"Slap!" Han Xiao slapped himself. Even after traveling through time, he still wanted a refund Am I an idiot!",Second, I crossed over as an NPC, but I unexpectedly have a player's system panel. This is undoubtedly good news, as I can level up just like players.。