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Nineteen years prior to the start of the series, queen Ahn Young gave birth to twin princes: one healthy and one barely breathing. The king, not wanting the twins to later fight for the throne similar to how he experienced with his own twin brother, left the child unattended by the royal physician. Minister Yi Ha found out about this and helped the queen hide the second-born baby from the king.
After getting him treated by Physician Ma, the minister brought the child to his home. He informed his wife about the dilemma and asks whether they could take the child under their care. Wanting to have a child for a long time, the minister's wife happily agreed to it. As the boy grew, his foster mother became close with him, having him hone his talent for painting and to be nourished in utmost affection and warmth. Amidst these, she and her husband saw to it not to let him leave their residence to ensure the child's safety and identity.
Eight years later, Minister Seo In Seon Woo and her husband met each other to have the seven-year-old Hwi enter the palace to serve as Crown Prince Yi Jeok's decoy. Albeit unbeknownst to Hwi, he happily went with his foster father to the palace, much to the grief of Hwi's foster mother. This would also be the last time they would see each other. Following the Jeogwa Revolution a year after her foster son's entry to the palace, she and her husband were killed by Yoon Yeon Lee's men. As part of the only people who knew about the second prince's identity, this left Seon Woo the only individual left who knew about Prince Hwi's royal lineage.