Enormous Legendary Fish (2020)

Both are Chinese fantasy/historical movies in which one of the leads is a human and the other a magical fish.

A girl is sacrificed by her people to marry a sea god/king of a mystical country to appease him. He is cursed and his appearance is that of a monstrous beast fish. It's a very similar plot where he tries to show his affection for her while she just tries to run away.

The FLs have a similar personality, both MLs are aquatic creatures, and both the settings/tone have a similar feel.

The FLs have a similar personality, both MLs are aquatic creatures, and both the settings/tone have a similar feel.