Protagonist: Lin Mo (30 years old, modern retired special forces/history buff), when visiting the Nanjing Massacre Memorial Hall, he accidentally touched a blood-stained pocket watch engraved with "1937" and traveled to Shanghai in 1937 on the eve of the Songhu Battle.
Background: He found himself in the war-torn Republic of China, surrounded by fleeing people, disintegrated soldiers of the national army, and the anti-Japanese war that was about to break out.
Core conflict:
