A Ying, the chief eunuch of the Zhaojian Bureau, secretly protected the Shen family during their time of crisis because he received the grace of a meal from someone five years ago. However, the eldest miss of the Shen family, in order to protect her personal affection, publicly framed A Ying. Facing returning enmity for grace, A Ying planned step by step, proved his innocence with ironclad evidence, and finally revealed his true identity as the superintendent of the Zhaojian Bureau. The whole drama revolves around the contest between grace and legal principles, conveying the positive values that personal affection cannot override public justice. The plot twists are dense and full of satisfying points, showing the protagonist's growth process of holding firm to the bottom line, punishing evil, and promoting good, making it a gratifying historical costume political intrigue masterpiece.