Jindu Prefecture Yin Huang Min is one of the parents of an official, and his daughter Huang Zixia is studious and motivated, intelligent by nature, upright and kind. She has helped her father solve cases since she was a child, and has repeatedly made extraordinary achievements.Unexpectedly, one day, the Huang family was brutally wiped out, and the only survivor, Huang Zixia, was framed as the murderer and escaped unjustly.

She traveled thousands of miles to Beiyan and asked King Li Shubai for help in retrialing the murder case.When Plan Four happened in Beiyan City, Li Shubai ordered Huang Zixia to find out the mystery behind it as her first test.

Huang Zixia concealed his identity and quickly detected the corruption and interest collusion behind the Four Plans, and became King Su's right-hand man.King Xun wanted to investigate the Huang Mansion murder case, but he was trapped in Beiyan City by the successive cases.

When King Xun chooses a bride, Queen Ruo of the Langya family is a strong candidate, but she fakes her marriage proposal and is repeatedly involved in life-and-death crises.

At the Jianfu Temple scripture meeting, someone died in the fire. Huang Zixia and Li Shubai worked hand in hand to finally reveal the unknown truths behind family, love, and friendship.Huang Zixia's justice and kindness gradually melted Li Shubai's cold shell, and the two embarked on a journey to find fairness and justice.