Sorry, I don’t know which “grain fields are hard to grow at the end of the world” you are referring to, so I can’t tell whether he is a liar. But I can give you some information about "Grain Fields".

"Wugutian" is a trademark name. Many companies in China have registered this trademark, such as:

1. Shandong Wugutian Food Co., Ltd.

2. Hubei Wugutian Agricultural Technology Co., Ltd.

3. Beijing Wugutian Biotechnology Co., Ltd.

If you encounter any of the above companies, then they are not scammers. However, if someone pretends to be one of these companies and commits fraud, they are committing fraud.

In short, if you have any questions or encounter any problems, it is recommended that you consult the relevant agencies or legal departments first to ensure that your rights and interests are protected.