Draw a Sword in the Snow and Cut Through the Night

Lin Yu, a newly graduated college student, was sleeping in his hometown when a voice suddenly came from his head. "The rain is about to come, and the trees are holding each other. Two trees are not a forest, and what falls from the sky is not rain. " Lin Yu opened his eyes suddenly and looked at the unfamiliar environment around him, his mind went blank. Where is this? Am I not sleeping in my hometown? How could it be... Lin Yu rubbed his eyes and suddenly realized that he seemed to have traveled through time... Did Lin Yu really travel through time, or was it just a dream...