Lin Yue, a girl from the Department of History, travels back to Qingpu County in 1927 where warlords were fighting because of a carved jade pendant. When she first arrived, she was taken in by the kind-hearted Wan Niang, but because of her modern words and deeds, she became an "alien" in troubled times.
An unexpected collision in the market led her to meet Gu Yichen, the son of a warlord. He was dressed in military uniform and had cold eyes, but he always helped her quietly when she was in trouble. With her modern ideas of equality and freedom, she is out of place in the old era: she goes head-to-head with Miss Su's family, uses first aid knowledge to save others, and even uses historical memory to help Gu Yichen avoid crises.
He struggled between family interests and patriotic ideals, but was moved by the vividness in her eyes, from indifferent to protective: "Follow me, at least you can live." Food shortages, spies, and wars followed one after another, and the jade pendant kept getting hot, as if it had mysterious guidance.
This love that spans a hundred years has gone through trials and perseverance in the wars of troubled times. When she describes a future of equality, he becomes determined to fight for that ideal. The secret of the mysterious jade pendant is hidden in the promise they kept together, witnessing the youth blooming in troubled times.
