Biography
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.
Filmography
Cast Credits

Trigger
Character: Moon Baek (teen)
TV • 2025

Fragment
Character:
MOVIE • 2024

Level 9 Chairman
Character: Na Yi-soo
TV • 2024

Beauty and Mr. Romantic
Character: Ko Pil-seung (teen)
TV • 2024

Queen of Tears
Character: Baek Hyun-woo (teen)
TV • 2024

Dr. Cheon and the Lost Talisman
Character: Young Dr. Cheon
MOVIE • 2023

Reborn Rich
Character: Jin Seong-jun (young)
TV • 2022

Under the Queen's Umbrella
Character: Prince Shimso
TV • 2022

Stock Struck
Character: Lim Ye Joon (teen)
TV • 2022

Alchemy of Souls
Character: Seo Yul (teen)
TV • 2022

Shooting Stars
Character: Gong Tae-seong (teen)
TV • 2022

The King of Pigs
Character: Kang-min (teen)
TV • 2022

The One and Only
Character: Min Woo-Cheon (teen)
TV • 2021

Hometown Cha-Cha-Cha
Character: Hong Doo-shik (teenager)
TV • 2021

Vincenzo
Character: Jang Han Seok [Teen]
TV • 2021

Hello, Me!
Character: Chae Seong-U / Chae Chi-Su
TV • 2021