Lin Xiaohai, a kitchen odd-job man, was expelled for exposing a restaurant's fake soup, and was dumped by his girlfriend. After accidentally eating a black-hearted snack, he awakened super-strong taste. Relying on his taste-discrimination ability, he helped stall vendors, exposed black-hearted merchants, and joined forces with blogger Su Meng, soy-sauce garden Chen Ya, and inspector Zhou Xiaoxiao to fight against capital black-hearted merchant Ma Guodong. He exposed the black factory of pre-made meal packs, adhered to genuine materials, founded True Flavor Food Workshop, and guarded the bottom line of catering integrity.