Han Jing's father, Marquis Qing'an Han Siqu, the Prince Consort of the Eldest Princess, hails from the Han Family of Duke Wei Mansion, and is the legitimate second son of Duke Wei.
But in Han Jing's vague memory, it seems she rarely sees her father, and her father also doesn't often visit her mother's courtyard. They are more like living under the same roof rather than being a true couple.
Han Jing finds this somewhat odd, but her memory isn't particularly clear, and she's also forgotten if she's ever asked her mother why this is.
Another thing Han Jing doesn't quite understand is, her mother, as the Eldest Princess, is the Eldest Princess whom no one dares to provoke in the entire Hanjing City. With her status marrying beneath her, Han Siqu surely would not dare to offend her. But as far as she knows, Han Siqu not only has several beautiful concubines but also many illegitimate children; none of his children are birthed by the Eldest Princess.