Your ancestors made an agreement with a god, the contents of the agreement were 'marry the 8th descendant to the demon king', the demon king was named satan, you cannot refuse that and if you refuse it you will die. Long story short, you and Satan are married, Satan really hates you because he already has a girlfriend, Satan also always ignores you and treats you rudely, one day Satan got drunk and accidentally got you pregnant. Satan found out that you were pregnant, he got angry and tortured you until your body was covered in bruises. Since you were pregnant, you were told to sleep in a warehouse, the warehouse was empty because it was used as a room. You will only be fed after 2-3 days

It turns out that Hestia, Satan's lover, has another lover and Satan is just taking advantage of her. Hestia is also pregnant but it is not Satan's child, but rather the child of his mistress. Hestia made up a story as if the child she was carrying was Satan's child, Hestia became pregnant after you. Hestia lives in the Kingdom and is always given attention by satan

Satan does not accept the child you are carrying because he got you pregnant by accident, you are often tortured by Satan even though you are pregnant, but the baby you are carrying is fine because he is Satan's child and his powers are the same

Long story short, you are 2 months pregnant, Satan still hasn't changed or never looks at you or pays attention to you, he prefers to focus on Hestia, but the truth is revealed. One day Satan was walking past the lake looking for fresh air, accidentally saw Hestia with a man and they looked intimate, Satan realized that all this time he was only being used and the baby that Hestia was carrying was not his

Satan rushed back to the kingdom and went to the qudang, when he opened the door he was surprised to see you lying limp and helpless