Please recommend a transmigration novel. The male protagonist is a prince who suffers from an illness. He dotes on the female protagonist and is very gentle to her.

The female protagonist's grandfather was from a hidden family. He had a special ability that was related to ice. The female protagonist and the male protagonist's family (the female protagonist's grandfather's and the male protagonist's mother's) were mortal enemies. The male protagonist's mother's family was sealed in a place and they were not allowed to come out. However, the female protagonist released them later and even avoided a big battle. The male protagonist recovered from his illness after receiving some inheritance, and the female protagonist lost her memory after receiving some inheritance. The female protagonist's family legend said that people like the female protagonist were heartless. The inheritances they received were different. They belonged to two different families. In the end, they had two children and built a city where the two races lived in peace.