Teacher A Zhi (Zheng Yijian) has been afraid of water since he was a child. He was rescued by the mermaid Xiaomei (Zhong Liti) from drowning, but the pearls in Xiaomei's body were accidentally swallowed by A Zhi. Xiaomei, who lost the pearl, was unable to return to the sea, so she had to pretend to be a student and enter Ah Zhi's school, hoping to get the pearl back. Unexpectedly, even if Ah Zhi was scared after learning the secret, he still had a beautiful mermaid love affair with Xiaomei. Paper couldn't contain the fire. Xiaomei's secret was finally discovered by the principal (Zheng Zeshi), and the principal decided to catch Xiaomei. Although Ah Zhi tried his best to save May, their relationship was...