A familiar book on the crown prince's desk baffles Ji-un. Running out of time and the means to save his friends, he asks Hwi for help.

Hwi earns a chance to gain the king's trust during the Ming envoys' visit, but an ill-tempered guest tests the limits of her patience.

Ji Un comforts a tearful Hwi in his arms. Hyun and Ji Un team up to figure out the envoy's secret after a suspicious man visits his quarters.