The two messengers, Hong Gu and Lushui, were assigned the task of secretly protecting the delivery team of the imperial court's disaster relief cash box. The junior sister Hong Gu was arrogant and did not understand why the messengers worked in the dark every time, as if they could not see the light. On the way, the cash box was robbed, but Hong Gu, who should have reported the letter in time, ignored Lu Shui's dissuasion and acted rashly and got involved in the fight. The man in black who robbed the silver box was highly skilled in martial arts, and the Yin-yin team was defeated. In the chaos, Aunt Hong caught a suspicious beggar and handed it over to Lu Shui to take care of her, while she went after the money box desperately. The beggar tore off the green water veil and fled, but accidentally left a jade pendant and fell to the ground....