A handsome 16 year old genius chef. Although he is considered to be a more knowledgeable chef than Mao, he is the one chef that could be considered as Mao's true rival in cooking. Unlike Mao, Fei is a calm and collected chef who can always do things in an organized manner. He was first introduced as one of Mao's opponents during the Super Chef tournament. Even though he was an opponent who seemed to have a cold personality, he helped Mao a few times during the competition. He, along with Mao, made history when they both passed the Super Chef test at the same time. It turned out that he knows about Mao's mother, and that he sees her as his savior.
When he was young, his entire family was killed by a mysterious organization that also kidnapped him. He was brought to them and went through strict training in oder to create perfect dishes. He was forced to go through torturous training everyday and if he didn't comply, he would be physically punished. When he escaped, he passed out in front of Kikkaro Restaurant. Pai found him, treated his wounds, and fed him herbal soup that rejuvenated his body. Before meeting her, Fei thought of cooking as this horrible thing that caused him so much pain. When he met her, he realized that cooking was something where you create dishes that would make people happy. After learning from her he went to travel around China.
When Mao encountered Fei again, Fei was a chef working for the Dark Cooking Society and was about to become the Head Chef of the Imperial Kitchen. Mao couldn't believe that Fei was a bad guy and challenged him to a cooking battle that would be judged by the Emperor himself. Mao ended up winning the battle and found out that Fei was being manipulated by the Underground. After being healed by the Legendary Cooking Utensils, Fei revealed that he was drugged by the Dark Cooking Society, so he would turn evil and become one of their pawns in taking over China. When he found out that the organization that killed his parents and kidnapped him was the Dark Cooking Society, he wanted to seek revenge and infiltrated their headquarters. Unfortunately, that was when he was captured and drugged. Even though he was being manipulated, his actions were still bad. General Lee ordered Fei to protect Mao as he looks for the Legendary Cooking Utensils (not to make it obvious that he was being lenient to Fei). So, Fei ended up travelling with the rest of the group.

(Source: Wikipedia)