The isolated city in the north was in flames. Su Lianyan, the daughter of the medical clinic, went upstream when the city was destroyed, and met Zhiyou, the general guarding the city, on a rainy night of blood and fire. She treated the wounded soldiers with her medical skills and conveyed information with her lonesome courage; he defended the city with his iron and blood, and made an oath of "live and die together" with his broken hairpin.
The city was defended, but his father Su Wenbai died in mysterious circumstances. An account book hidden under a withered locust tree revealed the shocking shady story of military corruption in the northern border - and the biggest suspect pointed to the Fang family business. Trust and suspicion, family feuds and state affairs, emotions and responsibilities are all intertwined in the snowy ruins.
Lin Pianpian, a lively and innocent girl, is accidentally involved. The love between the three of them is like ice and they can't be broken, let go, or get closer. When the corrupt leader Zhao Huaiyuan showed his fangs, when Fang Zhiyou went to the capital to seek justice, when Lin Pianpian ran away alone for the sake of justice - in this war-torn isolated city, everyone was using their own way to protect the plum blossom in their hearts that refused to wither.
