What episode is wonderful Grove's calligraphy?

The fifth episode. Wonderful Little Forest is a novel warm-hearted reality show with novel techniques and bold innovation. Four healing guests formed a "forest family" and filmed a variety show together with amateur cute babies with their own skills. The fifth episode is mainly about brush. Among them, Zhang Xincheng taught children to write Chinese calligraphy, which made the audience sigh that he was a schoolmaster. He not only studied well, but also wrote Chinese calligraphy.