Bow to Your Queen, My Lord Duke

Milana gave everything to support her husband Nethers, but he and her stepsister poisoned her, faked her death, and buried her alive. She is saved by the king and her childhood friend Tarik, and discovers she is the lost princess Natalie. Half a year later, she returns as a princess, uses evidence to turn enemies against each other, exposes the true killers, and marries Tarik.