The rules of the mermaid familieswere the same as humans, whereby the legitimate son had to inherit the throne. However, Lan Jingke's younger brother, Lan Yaoguang, was still a young kid. Therefore, the throne had to either be inherited by Lan Jingke or the uncle of the Lan family.
Of course, Lan Jingke did not want to let go of her family's throne, so she planned to inherit the throne first. However, there was a condition. She needed to find a very capable fianc first before she was able to inherit the throne.
Although Lan Jingke was very pretty, she possessed the characteristics of a man. She was very forthright and robust. Though she had a lot of friends in the mermaid family, she could not find anyone that was capable enough of being her fianc. However, it so happened that the severely injured Di Fuyi had suddenly appeared in front of her. What was more unexpected was the fact that Di Fuyi had lost his memories. He had even forgotten his own identity.
Di Fuyi was undoubtedly very capable. Lan Jingke who was worried about finding herself a fianc suddenly thought of an idea when she met Di Fuyi who had lost his memories. She lied to him that she was his fianc and that they were going to get married very soon.
Lan Jingke was very smart. She made up a story and convinced everyone that Di Fuyi was, in fact, her fianc. Even though Di Fuyi had lost his memories, he did not feel comfortable about the whole arrangement. He was skeptical about Lan Jingke's statement.
Fortunately, Lan Jingke explained to him that she merely treated him as a friend. Once she had crossed the hurdle and successfully inherited the throne, she would immediately cancel their engagement. After all, she had saved him before, and so Di Fuyi felt indebted to her. Therefore, he immediately agreed to help her.
Since they were acting, they had to make it look as if it was real. Therefore, the young Lan Yaoguang had been calling Di Fuyi as his brother-in-law ever since, and he never denied it.
Of course, the uncle of the Lan family did not want to let go of the throne so easily. He had created a lot of chaos from behind the scenes. Fortunately, all of the mess created by the uncle was easily solved by Di Fuyi. Slowly, the mermaid family recognized Di Fuyi's capabilities. Finally, Lan Jingke managed to inherit the throne after three years.
Lan Jingke excelled at fighting. She would have been an excellent choice for the position of lady general. However, it was challenging to ask her to be the Empress of the Mermaids. The state affairs always battered her.
On the other hand, Di Fuyi was an expert at dealing with state affairs. Most of the time, Di Fuyi would be able to solve issues very quickly. Lan Jingke treated him as her advisor, and so she often seeks guidance from him.
After some time, Di Fuyi and Lan Jingke became the best of buddies. They could talk about almost anything with each other. However, Di Fuyi soon regained his memories and discovered shortly that Lan Jingke had been fooling him.
Fortunately, Lan Jingke had been somewhat honest when it came to other matters, and she had been very good to him. She treated him like a brother. Whenever she had any treasures that Di Fuyi liked, she would give the treasure to him. Moreover, Lan Jingke sincerely apologized to him. She even bowed asking for his forgiveness, so Di Fuyi did not blame her regarding this matter. He just wanted her to explain to the mermaid family that he was not her fianc.
Lan Jingke hesitated to follow his request. She made up her mind and decided to tell him her secret. She was a lesbian. She liked a lady mermaid.
A same-sex relationship was not allowed in the mermaid family so the relationship between her and the other lady mermaid could not be exposed. It had to be kept as a secret for at least a decade while she was still inheriting the throne. Otherwise, it would be a mess for the royal family.
She pleaded Di Fuyi to continue being her nominal fianc. She did not need any ceremony to be held. All she needed him to do was to convince the mermaid family that he was her fianc. She also promised that Di Fuyi was free to marry someone else as soon as he had found his true love.