@Nk9bjP4A
Checked the raw translation "their love" is correct. Now onto the "my assumption" part
The orb didnt just took away her love, it also took away the guy's love. But since she made her way into his place, she kept her memories about him and wanted to make him fall in love with her again. Judging by the guy's startled face when she transformed back into mermaid, he probs have no idea and just think of her as one of his criminal underlings.
But the only reason he fell in love with her in the first place was her saving his life. So now when they met he doesnt give a shit about her at all. She used her father as a bargain chip to gain his attention.
Our MC probs demanded the Orb as compensation for his stolen shit. They gave it up to him only for him to destroy it. The "curse is gone", she transformed back into mermaid and the two regained their love for eachother and they are now happily ever after albeit still being criminals.
Father fishman is grateful that her daughter is doing well, but he will probably never accept her back into his family for extorting him. But the heroine of this story probs wont care since she got her prince charming riding on a cart of white powder now.