Half of the people on bewilderment Fog Island were Americans, and the other half were J-nationals. Zhang Wei, an intelligence agent from China, was mixed in with the J-nationals.
The Chinese and the J-people were the same race, so it couldn't be seen from their appearance.
Zhang Wei was a native of China and had received training at a very early age. Later, he changed his identity and infiltrated J-country. No one could find out his background.
When he first arrived in J country, he was not used to J country's food, so he simply made Chinese food himself.
Of course, he didn't cook immediately. There was a process. First, he ate Chinese food by chance and showed great interest. Then, he began to learn. After that, he didn't go crazy. He just kept a skill so that he could have a good meal when he was hungry.
However, in order not to expose his identity, he had been enduring it. He had only done it a few times in the first few years, but later on, he had not done it.