Ping/Hsu is a quiet, polite, and thoughtful nine year-old. Along with Ida and Oskar, he goes to Green Knowe for the summer holiday. He becomes fast friends with both Ida and Oskar, and is unfailingly kind and sincere. He makes sure that the others are prompt and punctual for meals, not wanting to offend either Miss Bun or Dr. Baggin.
While in town, Ping sees that the circus has come, and that Terak the Giant will be performing. He races back to tell Ida and Oskar, and the three of them bring Dr. Baggin to the circus. Despite Terak's presence, Dr. Baggin refuses to accept it, saying it is a circus trick. Ping is unhappy, wondering why adults never see what is right in front of them.
