Lin Xing rubbed his temples, he felt that there were some important memories he hadn't recalled yet, some that he told himself he must not forget, but at this moment, no matter how hard he tried, he couldn't remember.,But the reality is that the whole world is incredibly peaceful. The city he lives in hasn't seen a major crime in decades, and there's no news of any wars happening anywhere else abroad.,Just then, with a light crack, the front door of the classroom swung open.。