Prince Yi
On 12 February 1787, King Jeongjo made Lady Park as his concubine, with the prefix of "Su" meaning (蘇) "upright". In 27th day of July 1790, Lady Park gave birth to Prince Yi Gong (이공). In 1793, Lady Park gave birth to Princess Sukseon. In 1800, Prince Gong was appointed as Heir Apparent with the title of Crown Prince Gongbo.