According to Wikipedia,
Yi Kang, Prince Imperial Ui , also known as Prince Uihwa, was the second son of Emperor Gojong of Korea and his concubine, Lady Jang, who was a court lady-in-waiting. It was not until 1892 when he was recognized as a legitimate prince with the name of Yi Kang, and was titled Prince Uihwa with the style of Royal Highness, following a decree issued by his father. He married Lady Kim Sudeok, a daughter of an official in court, Kim Sajun. Prince Yi Kang was not the Crown Prince, even though he was older than his half-brother Prince Imperial Yeong, due to various reasons including the status of his mother.
Yi Kang is affiliated with the following schools: