Lady Jang Hui-bin the Royal Noble Consort Hui of the Indong Jang clan (November 3rd, 1659 – November 9th, 1701) is one of the best known royal concubines of the Joseon Dynasty
Her personal name was Jang Ok-jeong (Hangul: 장옥정, Hanja: 張玉貞). She was the daughter of Jang Hyeong (Hangul: 장형, Hanja: 張炯) and Lady Yun of the Papyeong Yun clan, She was oft cited as the most beautiful woman in Joseon, and her beauty was recorded to the Annals of Joseon.
Jeong became a lady-in-waiting to Queen Dowager Jangnyeol (King Injo's second queen) at the recommendation of Prince Dongpyeong (King Sukjong's first cousin once removed). In 1686, after a visit with his step-great-grandmother (Queen Dowager Jangryeol), King Sukjong saw her and made her his concubine with the title of suk-won (숙원, 淑媛</sup> In 1688, she was elevated to so-ui (소의, 昭儀), and in 1688 was elevated to the rank of Bin ( 빈, 嬪), with the prefix "Hui", meaning (慧) "intelligent, wise" or (輝) "bright and beautiful", after giving birth to a son (the future King Gyeongjong). She possibly had a second son, Prince Seongsu, but his identity is disputed. When Queen Inhyeon was deposed & forced into exile in May 1688, Jang Hui-Bin became Sukjong's third Queen Consort, backed by the Soron faction. Her son was made the Crown Prince.
Later, in 1694, with the reinstatement of Queen Inhyeon, Jang was demoted back to Hui-bin. In 1701, Queen Inhyeon died of an unknown disease. It was said that Royal Noble Consort Suk of the Haeju Choi clan told King Sukjong that the cause of Queen Inhyeon’s passing away was the curse by Jang Hui-bin. Jang Hui-bin, her brother and anyone involved were arrested. Jang was sentenced to death by poisoning, which was carried out on 9 November (the 10th day of the 10th lunar Month) 1701 at Chwi Seon Dang, her royal residence inside Changdeok Palace. It was said that Jang Ok Jung dies in the arms of Sukjong after drinking poison, as the latter looks on in despair. [https://en.wikipedia.org/wiki/Hui-bin_Jang#cite_note-3 [3 She was 42 years old.</p>
After this, on the seventh day of the tenth month in the twenty-seventh year of his reign (1701), Sukjong passed a decree prohibiting concubines from being allowed to become Queens Consort in the future. Jang hui-bin was known for her greed over power, wanting the queen title and a story in which she is said to have severely wounded her son (then the Crown Prince (future King Gyeongjong)) making it impossible for him to produce a heir.[
She was buried in Daebinmyo tomb in Seooreung (Address : 334-92, Seooreung-ro, Deogyang-gu, Goyang-si, Gyeonggi-do). Her memorial tablet was enshrined in Daebingung at Chilgung or "Palace of 7 Royal Concubine".
Nevertheless, as the mother of the Crown Prince, she was given the posthumous title "Lady Oksan, Great Concubine of the Palace; Prefectural Great Concubine of the Indong Jang clan" (대빈궁옥산부대빈장씨 大嬪宮玉山府大嬪張氏).