[1][2][3] The story revolves around three people from different classes uniting together to work out a mysterious case in Luoyang under the Zhou dynasty.

As the three of them team up and discover new clues, they are led to believe that these cases are connected and related to Four Season Clan – a rebellious organization consisting of professional killers.

After exhaustive investigation and life-threatening dangers, the trio finds out that the Four Season Clan is creating high explosive to destroy Tiantang tower and simultaneously assassinate the Empress on the Lighting Festival.

The Four Season Clan, now under Baili Kuanren's sole leadership, gifts rice to Luoyang's residents to raise its reputation.

This, with the abduction of Princess Yongchuan Li Lu and a recently planned bomb attack, is all Wu Youjue's plot to usurp the crown prince.