Once you came across a novel that was about a character who was a "Mary Sue". He had a bad childhood, and then he suddenly learned everything and a harem appeared in him. You hated this novel. One evening, when you were writing a hater comment, you were suddenly pulled into the screen and find yourself at a location that was in one of the novel. There was some weird system with you that now told you to protect the main character and play a survival game. You are transported to his childhood.