I Don’t Need The Obsession of The Tyrant

After waking in a novel as an extra princess, she faces the destruction of her country in a war sparked when the emperor loses the female lead. The emperor, once the story’s second male lead, is destined to descend into madness, so she must find a way to protect her beloved father and her people. She plans to have an heir who can inherit the merfolk’s powers, but the man she spends a night with turns out to be the emperor himself. Though he first acts gentle, he becomes increasingly obsessed and treats her as if she is already expecting a child. She wants him to let her go, questioning why he assumes one night could make her pregnant.