Yan Yu, a reclusive poison doctor, disguised herself as a man to take the imperial examination. She relied on her meticulous thinking and poison identification skills to pass the imperial examination. She unexpectedly met Wei Zheng, a military general guarding the border fortress. The two of them worked together, openly and secretly, to uncover the vicious plotters in the court who were colluding with the evil factions in the world, and to maintain peace in the turbulent current situation.
