Time Travel? Entering the Game for the First Time

Ye Chen came to a space and met a self-aware machine. He let Ye Chen enter his space and helped it retrieve its lost memory. In this way, Ye Chen entered a game and played dungeons until demons invaded and obtained a sign-in system. Signing in will make him stronger. That space will always turn into an old man to remind him of his memory, but Ye Chen doesn't know how to find such a thing as memory. He can only look for it slowly until he finds it, and Ye Chen can return to his own world. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.