Lin Xiaoling, a modern-day snack vendor, accidentally travels back in time to an ancient border city. Using modern food, she helps feed disaster-stricken refugees. She grows close to Shen Yi, a young nobleman, and together they use modern knowledge to tackle political and social challenges, resolve a local famine, clear up old wrongful convictions, and uncover the truth behind the time-travel passage. From their initial distance to mutual trust, the two join forces to protect peace in the border city and find a place to call home.