The US president's granddaughter is a powerful beautiful hunter, British nobility / royalty hunter with a deep sense of honor, super powerful returnee with an overly casual attitude toward sudden dungeon appearances on earth, childhood friend on the verge of being ditched for higher level beauties, becoming super famous and desired by every country... I have to struggle to remember that the story is Japanese and not Korean, since these are all tropes I heavily associated with Korean returnee novels.