Gu Qinghuan, a female folk doctor, sneaked into the general's mansion to investigate an old case of massacre, but she fell into a love-hate entanglement with the cold-faced general Xiao Chengyu. He saved lives many times due to her medical skills, but was imprisoned because of her paranoia because her facial features were similar to those of her old enemy; she was guilty of seeking the truth, but lost control of her efforts to save him when he was injured. From the temptation of "using medicine as the blade" to the sinking of "using the heart as bait", the two were repeatedly involved in the massacre, the regicide, and the border battle - he locked her in his arms with an iron chain, and she stabbed his heart with a silver needle. It was not until the blood soaked the marriage letter that the real culprit of the massacre was actually the person closest to each other.
