Crown Prince Sado
Later in 1760s, Crown Prince Sado was executed in 1762; Royal Noble Consort Yeong, their mother, died in 1764. Princess Hwawan was asked to be the protector of Yi San, son of Crown Prince Sado and the new crown prince, and he would be later King Jeongjo of Joseon. Around the time, Princess Hwawan was much trusted by her father, and the young crown prince could remain safe in the rest of Yeongjo's reign. However, in attempt to control him, she estranged the relationship between the crown prince and crown princess (later Queen Hyoui); her adopted son, Jeong Hu-gyeom was involved heavily in troublesome Political factions in Joseon dynasty (between the Hidebound and Opportunist Factions). The mother and son, along with parties from some of the officials, caused the family members of Lady Hyegyeong (who bore Jeongjo) to fall from power, which threatened the identity of Jeongjo as a crown prince.