The Mermaid 1965 Screenplay by Cheh Chang and directed by Li Kao. A Hong Kong Huangmei opera play from the Shaw Brothers. Ivy Ling Po plays a male character, a common thing in the Huangmei opera, like it was during Shakespeare's time.
Zhang Zhen is betrothed to the daughter of Prime Minister Master Chen. Zhang visits the family compound to meet his obligation. He isn't well received by the PM. Zhang's family has fallen on hard times since the agreement was made and Zhang isn't seen as a good candidate for a husband. The PM tells Zhang that he'll reconsider him if he becomes a top scholar.
A year later Zhang hasn't done as well as he hoped and his betrothed Peony has long since forgotten him. No matter Zhang has made friends with a carp and the fish in a pond outside his study. The carp spirit visits Zhang disguised as Peony and he thinks she's interested in him. Time passes before he sees her again. If fact, when he does, he's seeing the real Peony, she rebuffs him again.
Thing go around and around and there's way too much singing and dancing about for me. Goddesses get involved and bring about a happy ending. It was mostly entertaining and I did like the under the water sets, all the fish and the underwater flora. You can take a crack on it on YouTube. Maybe you'd like it.