the things i remember is that -the FL was taken with other girls as a sacrifice/bride to the demon/ghost king -the FL was place in the mansion/palace that the ML's mother used to live in by the housekeeper/coachmen ghost? -the ML was actually human but because he was betrayed and killed he combined with a demon and the handsome face he has actually is a mask. -the ML needs to go to war but doesn't know that the FL is pregnant. he left for 5 years? and the FL go over to him cause she knows there's something wrong. -in the end she sacrifice herself by turning into a calamity and change the ML back fully into human. and she left a bunch of holographic things for her daughter and ML. i hope to find this novel soon! thank you in advance!