Episode 13. According to the official website of TVCat, in the 13th episode of the anime "Pleasant Goat and Big Big Wolf: Sheep Little Detective", Feiyangyang asked for Bianzuilun's signature on behalf of Nuan Yangyang, but Bianzuilun signed with squid ink, which was very strange. The signature on the fast paper disappeared, and Hou Feiyangyang asked Bianzuilun to solve the case.