I want to publish a book under the pseudonym "Magic Pen and Good Horse". Is it infringement?

This is an infringement. A good horse is a fairy tale created by Hong, a famous Chinese children's literature writer, theorist and fairy tale master. It has won numerous awards internationally and is a household name in China. This is a classic literary masterpiece. "A Good Horse" is original, and Mr. Hong enjoys all copyright (enjoyed by his heirs after death) and is protected by copyright law and other relevant laws.