The Tale of Lady Ok S01E04 - The Secret Organisation

Gu Deok I rejects Yun Gyeom's marriage proposal and reveals that she is slave-born. Yun Gyeom also reveals one of his secrets to make Gu Deok I feel safe, and they end up getting married. Later, Gu Deok I finds out that Yun Gyeom has been a part of an organisation that helps children who have nowhere to go. Chief Lee hears about the organisation and accuses them of planning treason.