In the late Joseon Dynasty, a family rises to wealth through the art trade. However, a mysterious event unfolds when the son, Hong Rang, returns after a decade-long disappearance with no memory of his childhood. His half-sister, Jae I, who has been close to him since childhood, now seeks the truth behind his sudden disappearance.Jae I, intelligent and beautiful but with a troubled personality, lives with an abusive stepmother and neglectful father. She had relied on Hong Rang, but her life took a difficult turn after his disappearance. Hong Rang, who had grown up in luxury, returns to find his true identity, which is a mystery to all.(Source: MDL)~~ Adapted from the novel "Tangeum: Swallowing Gold" (탄금) by Jang Da Hye (장다혜).