Love in the Moonlight

Park Bo-gum as Lee Yeong, the Crown Prince.

Jung Yoon-seok as young Yeong

Kim Yoo-jung as Hong Ra-on/Hong Sam-nom, Lee Yeong's lovge interest.

Kim Ji-young as young Ra-on

Jung Jin-young as Kim Yoon-sung, a scholar, Ra-on's childhood friend.

Lee Hyo-je as young Yoon-sung

Chae Soo-bin as Jo Ha-yeon, daughter of the Minister of Rites, she is chosen as the crown princess of Yeong.

Kwak Dong-yeon as Kim Byung-yeon, head of the Royal Guard of the Crown Prince's palace, Yeong's childhood friend.

Noh Kang-min as young Byung-yeon

Kim Seung-soo as the King

Seo Jeong-yeon as Queen Yoon

Jeon Mi-seon as Park Suk-ui

Jung Hye-sung as Princess Myeong-eun

Heo Jung-eun as Princess Yeongeun, Lady Park's daughter.

Kim Jin-yi as Pregnant court lady

Jang Gwang as Eunuch Han

Lee Jun-hyeok as Eunuch Jang

Jo Hee-bong as Eunuch Sung

Choi Dae-chul as Eunuch Ma

Tae Hang-ho as Do Gi

Oh Eui-shik as Park Seong Yeol

Cha Joo-young as Ae Sim-i

Jung Yoo-min as Wol-hee

Chun Ho-jin as Kim Heon, Prime Minister.

Han Soo-yeon as Queen Kim

Park Chul-min as Kim Eui-gyo, Minister of Personnel.

Bang Joong-hyun as Kim Geun-gyo, Minister of Taxation.

Jung Hae-kyun as Hong Gyeong-nae

Kim Yeo-jin as Kim So-sa

Lee Dae-yeon as Jo Man-hyeong, Minister of Rites.

Ahn Nae-sang as Jeong Yak-yong

Ahn Se-ha as Master Jung Deok-ho

Kim Byung-chul as Yeong's teacher

Cha Tae-hyun as a farm servant

Cho Yeo-jeong as a noble lady

Jung Yi-rang as gukbap lady

Lee Sung-jae as master Jeong

Lee Moon-sik as a man who castrates

Kim Seul-gi as a eunuch trainee