Gao Che, a young military doctor who appears innocent and harmless but is actually thoughtful, is forced to have a flash marriage with Shen Lie, the leader of the Zhenbei warlord due to an accident. Shen Lie is cold and cruel, never letting down his guard in front of others, but he only has an inexplicable obsession with his "new wife" Gao Che. After getting married, the two have their own thoughts. During the day, Gao Che plays the role of a docile and virtuous wife, but late at night, he is studying how to use his own mysterious medical system to crack the deadly virus hidden in Shen Lie - which was the secret key that could control the entire warlord system back then. As the daily interactions progress, Gao Che's "pretending to be innocent" gradually becomes his biggest protective color. He saves Shen Lie in danger time and time again, but is also involved in the power struggle among the warlords in the three northern towns. Shen Lie began to notice something strange about his wife, but he didn't dare to ask, fearing that asking would mean goodbye. Growth is a lonely journey for a person, but when two lonely souls are forced to rely on each other, the boundaries between healing and being healed begin to blur. In troubled times, a flash marriage is just a contract, but no one can be exempted from the price of heartbeat.
