1x17 - The King 2 Hearts

Hang Ah manages to convince Jae Ha about the abdication in a video conversation. Bong Goo threatens Hang Ah and forces her to act pitiful to melt Jae Ha's heart. In the video conversation, Jae Ha expresses his willingness to abdicate. Hang Ah pretends to be pitiful in front of Jae Ha and actually implies about the hijacking and hijacking locations.