It was an ancient romance novel. The female protagonist was a mermaid. In the end, the male protagonist died protecting the female protagonist, but the female protagonist lost her memory and waited for the male protagonist by the beach.The plot of this ancient romance novel was as follows:
The female lead was a mermaid with special knowledge of marine life, while the male lead was a smart and brave warrior. At the beginning of the story, the male protagonist was attracted by the female protagonist's beauty and talent, and the two fell in love.
However, the identity of the male lead was closely related to the female lead because the female lead's father was the supreme ruler of the merfolk world while the male lead's father was her love rival. In order to protect himself and his family, the male protagonist decided to marry the female protagonist at all costs.
On the day of the wedding, the male protagonist was assassinated by hostile forces, but before he died, he still protected the female protagonist and let her leave safely. The female lead lost her memory due to grief.
After losing her memory, the female lead had been waiting by the beach for the male lead to appear. She gradually recovered her memory and realized her feelings for the male protagonist by learning about marine life. In the end, the female protagonist successfully defeated the hostile forces with her new identity and firm belief and returned to the Merman World. The male lead presented the most precious gift to the female lead to express his love for her the first time they met after she returned to the mermaid world. The two of them finally lived a happy life together.
The female protagonist stuck the four-leaf clover necklace given to her by her mother on the mirror and crossed over. She met the male protagonist, who was only a teenager at that time and was being hunted down. The female protagonist saved him.Such plots were commonly referred to as " transmigration " or " time travel " novels. In this story, the female protagonist traveled to a different world and met the male protagonist. She found that they had met in another time and space, and the accidental behavior of the female protagonist led to the intersection of this time and space.
In this story, the heroine's mother once gave her a four-leaf clover necklace. She would usually stick the necklace on the mirror to commemorate her mother. In this time and space, the heroine stuck the necklace in the mirror and then transmigrated.
The male protagonist might be being hunted in some space-time, and the arrival of the female protagonist allowed him to escape. There might be emotional entanglements between the heroine and the hero. They would find out that they had met in another time and space and find a way to return to their original time and space together.
This was a very interesting plot, which usually involved time travel, fate intersection and other elements, but also tested the protagonist's wisdom, courage and perseverance.