Mei ren yu AKA The Mermaid (2016) by Stephen Chow

Plot:
Xuan’s estate project involving reclamation of the sea threatens the livelihood of the mermaids who rely on the sea to survive. Shan is dispatched to stop Xuan and this leads them into falling for each other. Out of his love for Shan, Xuan plans to stop the reclamation. Unfortunately, Shan and the other mermaids are hunted by a hidden organisation and Xuan has to save Shan before it’s too late…