Moon River

Also known as: Lee Gang, Lee Kang

Crown Prince Yi Gang appears wild, unruly, and pleasure-seeking, but privately hides deep grief after losing his beloved Crown Princess to a palace power struggle. He becomes the reluctant heir who pretends carelessness to survive court politics, silently enduring the weight of his position while planning revenge. Everything changes when he encounters Park Dal I, a woman who looks exactly like his deceased wife, and the two mysteriously swap bodies, pulling him into a chaotic path toward truth and healing.

Also known as: Lee Hee, King of Joseon

Yi Hui is the reigning King of Joseon and Crown Prince Yi Gang's father, though in practice he is a puppet ruler manipulated by Left State Councillor Kim Han Cheol. His powerless position anchors the central conflict of the drama in palace politics, illustrating the extent of Kim Han Cheol's control over the throne.

Also known as: Oh Shin-won, Left commander of Ikwisa

O Sin Won serves as the Left Commander of Ikwisa and is a loyal friend and warrior to Crown Prince Yi Gang. His unwavering support highlights the strong bonds of friendship within the prince's inner circle amid the palace's political dangers.

Also known as: Yoon Se-dol

Yun Se Dol is Crown Prince Yi Gang's personal eunuch, having grown up alongside him since childhood out of genuine loyalty. He claims he became a eunuch purely out of devotion to Yi Gang, but this is not entirely true, and he tends to reveal the real, more embarrassing story of how it happened when drunk, adding comic relief to his close bond with the prince.

Also known as: Heo Young-gam

Heo Yeong Gam was once a fierce general who ruled the seas but is now completely disarmed by devotion to his precious daughter, born when he was over fifty. He lives solely for her, willing to set aside his pride and even weep openly on her behalf. His daughter's crisis, being forced by her in-laws to take her own life, is what draws Park Dal I into the capital at the story's start.

Also known as: Minister of Personnel Ja-gyeong

Kim Ja Gyeong is the Minister of Personnel, a close ally and distant relative (fifth cousin) of Left State Councillor Kim Han Cheol. He is greedy but lacks political insight, often irritating the Councillor despite their family and political ties.

Also known as: Cha Eun-woo

Cha Eun U is an apprentice with the Hanyang merchant guild who serves in a role akin to Crown Prince Yi Gang's personal stylist. Despite his impressive-sounding name, his looks are described as falling short of expectations, giving him an unexpected, self-deprecating charm within the prince's circle.