In the winter of the 23rd year of Chengning, heavy snow closed the mountains outside Yanmen Pass.
Xie Heng, the commander-in-chief of the Dingbei Army, was poisoned by a strange poison and was sent to Yunqishan for medical treatment by his deputy, risking his own life. In the medicine house, Shen Zhiwei, a cold-blooded medical girl, recognized the highly poisonous "Pulse Machine" at a glance - this was the poison that killed her entire family seven years ago.
On a snowy night, the fates of two people carrying their own pains quietly intertwined.
