Shen Tang and her close friend head to the palace to participate in the imperial consort selection. Along the way, they encounter an out-of-control strange man. The two remain calm and handle the situation bravely. Impressed by their courage and reliability, the palace selects them as female imperial guards responsible for protecting Emperor Xiao Yan. The emperor suffers from a rare, unusual poison that frequently leaves him troubled and restless. His uncle and the Dowager Consort secretly conspire, using the poison to create chaos and seize power. Amid countless dangers, Shen Tang remains loyal and righteous, always composed and level-headed. She repeatedly puts herself on the line to protect the emperor, working together with her partner to navigate dangerous situations and secretly gather evidence of the conspirators' schemes. Together, they dismantle every plot and restore peace to the imperial court.