Lee Yul begins a secret investigation after growing suspicious of his worsening health; Yeon Hong-sim returns to Hanyang in search of her brother.

Yul continues to investigate the attempt on his life, uncovering some hard truths; Hong-shim and Yul meet.

An amnesiac Yul tries to adjust to married life with Hong-shim, who is irked by his bratty behavior and doesn't hesitate to let him know it.

Yul's haughtiness continues to cause problems between him and Hong-Shim, while King Neungseon grows more and more worried about his son's disappearance.

News of the crown prince's passing is made public; Hong-sim is delighted to learn of Won-deuk's ability to read and write.

Hong-sim's reunion with her brother doesn't go as expected; Eunuch Yang notices something off about the crown prince's dead body.