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Hello!! I am searching for a book that I can’t find in my library. The female lead transmigrates into a novel she read before. The character she is possessing is supposed to die early so she throws herself to a CEO that’s is powerful. She is always lying to him saying that she loves him, but he knows she is lying. She has a system that’s sometimes gives her clues that the original female lead is a spy that wants to kill the CEO something like that. I remember an scene where the male lead takes her to a mansion and he tells her to not move even if she hears something. Then she hears cries for help that sound like a little boy so she decides to go and open the basement where the boy was locked. The boy tries to kill her but is unsuccessful. The little boy is the male leads older brother and he was cursed to the body of a little boy. Then she finds out that tue male lead in fact has powers and that she is his destined mate. She also finds out that there is a secret underground world which is the home of the male lead. Since she is his mate people are going to try to kill her so he is trying to protect her and so he takes her to the underground world.