So, bear in mind, i am not up to date at the raws i stopped at the Mobei(?) country arc ( forgot the name, but that is the country where MC's ex's princess lover turned crazy came from), but in the confrontation where HN with her maid egging on, tried to dupe the prince on killing MC, and MC escaping death thus also revealing the truth who really saved him, HN was actually shot through an arrow that imbedded her in a wall from MC. She had to retreat, nothing happened to her as she has a powerful grandfather, that the prince didn't do anything to her just express his disappointment to her treachery..
HN, will be schemed by MC's uncle so his son can marry her and be on the express track to a high position, by using the save the damsel-in-distress and be responsible as he had already touched her body. Then the thing with the uncle's family happened so that marriage didn't happen... then from what i last read, this happened at the anniversary of MC's paternal grandfather's death, he was really famous so many are visiting to pay respects, including the Hu elder, HN's grandfather. Then things happened, but HN schemed to have a fake taoist read that the only way to save the Hu elder is if the MC go into exile for a couple of years. Fortunately, the character that appeared wasn't the MC's but HN, then assumptions ran rampant. The public automatically linked the elder's declining health starting from her birth, then her refusal to sacrifice some years outside the empire in exchange for her grandfather's health made people ridicule her. Good thing her father came and when he found out the issue, he forcibly sent HN away. The taoist was still happy as he will still be accompanying a beautiful woman, the taoist is a lusty crook, idk what will happen HN actually...