I recommend you the transmigration novel "Secret Service Princess Consort: Your Highness, Stop Pretending". The female lead, Su Yan, was not only a foodie but also a spy who knew poison techniques. She also took the Fifth Princess as her disciple. In order to complete the mission, she got close to the silly prince, the crown prince, the Fifth Prince, the crown prince, and the others, and started a thrilling story. I hope you like this fairy's recommendation. Muah ~😗