Ahn Yeon-seok (born April 11, 1984), better known by the stage name Yoo Yeon-seok, is a South Korean actor. After making his acting debut in 2003 with a small role in Oldboy, he resumed his acting career in 2008. His notable works include the films Re-encounter (2011), Architecture 101 (2012), A Werewolf Boy (2012), Whistle Blower (2014), and Love, Lies (2016), as well as the television series Reply 1994 (2013), Dr. Romantic (2016), Mr. Sunshine (2018), Hospital Playlist (2020–2021), and When the Phone Rings (2024).

Filmography

• Phantom Lawyer — Shin I-rang
• 2026The Assassin(s)
• The Perfect Lie — Min Jun-ho
• 2025No Other Choice — Chin-ho
• Resident Playbook — Ahn Jeong-won, Theme Song Performance
• Tastefully Yours — Jeon Min
• When the Phone Rings — Baek Sa-eon
• A Bloody Lucky Day — Geum Hyuk-soo
• 2023My Heart Puppy — Min-soo
• Nattering with Nah
• Narco-Saints — David Park
• The Interest of Love — Ha Sang-su
• 2022Vanishing — Park Jin-ho
• 2021New Year Blues — Jae-heon
• Together Rewind
• 심야병원 — Yoon Sang-ho
• Hospital Playlist — Ahn Jeong-won
• 2020Steel Rain 2: Summit — Jo Seon-sa
• Busted! — Yoo Yeon-seok
• Mr. Sunshine — Gu Dong-mae
• 2016A Quiet Dream — Man on a Motorcycle
• Dr. Romantic — Gang Dong-ju
• 2016Love, Lies — Kim Yoon-woo
• 2016Mood of the Day — Kim Jae-hyun
• 위키드(WE KID)
• 2015Perfect Proposal — Lee Sung-yeol
• 2015The Beauty Inside — Woo-jin 123
• Warm and Cozy — Baek Geon-woo
• 2014The Royal Tailor — King Yeong-jo
• 2014The Whistleblower — Shim Min-ho
• 2013Born To Sing — Dong-soo
• 2013Hwayi: A Monster Boy — Park Ji-won
• Kangchi, the Beginning — Park Tae-seo
• Reply 1994 — Chil Bong-yi
• 2012A Werewolf Boy — Ji-tae
• 2012Architecture 101 — Jae-wook
• 2012Eighteen, Nineteen — Ho-Ya
• 2012Horror Stories — Kidnapper
• 2012Two Weddings and a Funeral — Joon
• What is Mom — Yoo Yeon-Seok
• 2011Homicide Sonata
• Late Night Hospital — Yoon Sang Ho
• 2011Moscow
• 2011Re-encounter — Han-soo
• Running Gu — Heo Ji-Man
• Running Man
• Dream — Noh Chul-joong
• Melon Music Awards — Messenger
• 2009Money Show — Man
• Possessed — Baek Joong-chan
• General Hospital 2 — Woo-jin Heo
• 2003Oldboy — Young Woo-jin
• Princess Covet the Scholar — Seo Yul

Appearances as themselves (17)

• Yoobari Talkbari — Self - Host
• A-List to Playlist — Self
• Whenever Possible — Self - Host
• Bro&Marble in Dubai — Self - God Bro
• Salon Drip — Self
• The Seasons — Self
• Just an Excuse — Self
• Hospital Playlist Goes Camping — Self
• The Game Caterers — Self
• Three Meals a Day: Doctors — Self
• Hospital Playlist Throwback — Self
• Coffee Friends — Self
• Amazing Saturday — Self
• You Quiz on the Block — Self
• Park Jin-young's Party People — Self
• 2016Old Days — Self
• Youth Over Flowers — Self