Xiao Yu, the prince of Prince Jing'an, is a famous foodie in the capital. One day he picked up an orange cat, Tuanzi, and discovered that Tuanzi was a cat demon that could take human form and could sense danger in advance. The hypocritical cousin Liu Rumei pretends to be gentle and approaches Xiao Yu, but in fact she is a spy of the enemy country and wants to use Xiao Yu to steal the military defense map. She also colludes with the officials in the palace to slander Su Qinghuan in an attempt to take away the position of the crown prince. Xiao Yu disguised himself as a "foodie" and relied on Tuanzi's early warning and Su Qinghuan's medicinal diet to counter the routine and expose Liu Rumei's conspiracy, catch all the spies, eat all the delicious food in the capital, and live as the most enjoyable prince in the capital.
