I'm not sure about the exact plot as I haven't read this novel specifically. But generally, it might involve a story where the male lead brings his secret lover back from the dead. Maybe there are elements of mystery, love, and perhaps some challenges they have to face together in their new - found situation.
I don't have information about the specific main characters in this novel. However, it's likely that the male lead who brings his secret lover back from the dead is one of the main characters, and of course, his secret lover herself.
Since I haven't read the 'his secret lover novel', I'm not sure about its main theme. It could be about love, given the title mentions a 'secret lover'.
One common theme is redemption. When a character can return from death, they often get a chance to correct their past mistakes. For example, in some novels, the character might have made bad decisions that led to the death of someone they loved. By coming back, they can try to prevent that from happening again.
One popular 'returning from death novel' is 'Re:Zero - Starting Life in Another World'. In this novel, the main character Subaru has the ability to return from death, which adds a lot of interesting twists to the story as he tries to change events and save those he cares about.
I'm sorry I haven't read this novel specifically, so I can't recommend reviews directly. But you can try searching on some book review platforms like Goodreads.
During the Victorian era, there were many secret love affairs. A well - known story was of a young artist and a married woman. The artist would use his art as a way to communicate his love to the woman. He would paint pictures with hidden messages for her. They had to keep their relationship secret as it was unacceptable in the society of that time. Their story was one of longing and secrecy.
Love against all odds is also a theme. In these novels, the secret lovers usually face many difficulties, but their love is so strong that they keep fighting for it. For example, in many historical 'secret lover novels', the lovers might be from different social classes, and society would not approve of their relationship, yet they still pursue their love.
One popular 'ceo secret lover novel' could be 'The CEO's Secret Love'. It tells a story full of twists and turns about a relationship between a CEO and his secret lover. The plot often involves office politics, family opposition, and the deepening of their love against all odds.
From the search results provided, he did not find any relevant information about " returning from the immortal world to find his sister ". I don't know the answer to this question.