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Acting
Moon Seong-hyun is a South Korean actor born on June 2, 2006. He is known for playing the younger versions of male leads in several popular K-dramas, beginning his career in 2021. He is managed by FNC Entertainment. He first appeared in the 2021 dramas Vincenzo and Hometown Cha-Cha-Cha. He gained significant recognition for his role as the young Seo Yul in the fantasy drama Alchemy of Souls and as Prince Simso in the historical series Under the Queen's Umbrella. His emotional performance in the latter received high praise. In 2024, Moon took on his first starring role in the web drama The Chairman of Class 9.he was nominated for "Best Young Actor" at the 60th Baeksang Arts Awards and won "Best Young Actor" at KBS Drama Awards with Beauty and Mr. Romantic.

Trigger
as Teenage Moon Baek

Fragment

The Chairman is Level 9
as Na Yi-soo

Beauty and Mr. Romantic
as Ko Pil-seung (teen)

Queen of Tears
as Baek Hyun-woo (teen)

Dr. Cheon and the Lost Talisman
as Young Dr. Cheon

Reborn Rich
as Jin Seong-jun (young)

Under the Queen's Umbrella
as Prince Shimso

Stock Struck
as Lim Ye Joon (teen)

Alchemy of Souls
as Seo Yul (teen)

Shooting Stars
as Gong Tae-seong (teen)

The King of Pigs
as Kang-min (teen)

The One and Only
as Min Woo-Cheon (teen)

Hometown Cha-Cha-Cha
as Hong Doo-shik (teenager)

Vincenzo
as Jang Han Seok [Teen]

Hello, Me!
as Chae Seong-U / Chae Chi-Su