Normal pair-World traveller

At 2am, suddenly he get to transport to this white room where he learn that he must survive in this strange world. Its like a game world but if ypu die......for that when he come back to real world he need to prepare before he will be summon at 2am everyday and survive. But who, why and how they transport him from his world remain a mystery

MC is trown in a world that maybe exists in ancient china time and maybe he have to take bl route. He knows he is world traveller and many thinks he have a pit in his brain