What episode is the ring that bubble mermaid Yeris gave Zheng Zheng?

The Ring from bubble mermaid to Zheng Zheng is the 25th episode. According to relevant public information, bubble mermaid tells the story of three girls who accidentally fell into a pool in the center of a mysterious ancient temple while they were out to sea, and were turned into mermaid by moonlight. Since then, they have magical powers. Later, with the help of friends, they fought the evil forces behind the scenes with courage and wit, and protected the blue marine environment.