Cheng Mo, an ordinary office worker, unexpectedly gains the ability to travel through different historical dynasties after falling asleep every night, becoming a "spectator" of history. He can witness major events but cannot change the course of history. Meeting Su Shi for the first time: Cheng Mo traveled to the Northern Song Dynasty for the first time, met Su Shi who was demoted to Huangzhou, witnessed the creation process of "Red Cliff Ode", and was deeply infected by Su Shi's open-minded spirit. History Class: After Cheng Mo returned to reality, he found that he could remember all historical details, and began to use his ability to travel back and forth to verify historical records, and shined in the history class. Get to know the professor: Cheng Mo's unusual behavior attracted the attention of Professor Lin from the History Department. The two established a teacher-student relationship, and Cheng Mo began to systematically record his time-travel experiences. Witness the tragedy: Traveling back to the late Southern Song Dynasty, Cheng Mo witnessed the tragic scene of Wen Tianxiang being taken to Dadu, and felt the weight and powerlessness of history. Ability and Responsibility: Cheng Mo gradually realized that this ability to travel is not only an adventure, but also a responsibility, and began to think about how to spread the historical truth without changing history.