Food delivery rider Lin Xiaoxi and psychologist Su Lengleng accidentally travel through time to the Great Jing Dynasty. Lin Xiaoxi rides her pink electric scooter fearlessly through the ancient streets, while Su Lengleng possesses mind-reading abilities and a Truth-Telling Talisman that lets her see through people's hearts. Together, they establish the Joy and Sorrow Detective Agency, helping ordinary people expose scumbag men and punish local bullies. All they want is to live peacefully and make money. Little do they know that they will become entangled in one conspiracy among the powerful after another, attracting the attention of the mysterious Imperial Preceptor behind the scenes. The iron-faced constable Gu Chen and the cold-faced general Xiao Jing are also drawn into the turmoil. At the most critical moment, the system suddenly malfunctions, and all their advantages disappear. Trapped in danger, can the two best friends rely on each other to turn the tide?