Yu Si-eun (Korean:유시은; born 1998) is a South Korean model. She was runner up for Miss Korea in 2022, and gained further attention through her appearance in the series Single's Inferno Season 3 (2023–2024) when she was 27. She started the show with 73,000 Instagram followers, highest of any cast member. She and her fellow Miss Korea competitors were later widely credited with bringing glamour and narrative drive to the Single's Inferno programs.
Yu and the rest of the Single's Inferno 3 cast modeled for Dazed as the show was airing, and she reunited with fellow participant Choi Hye-seon to model for Alice + Olivia after the show's finale. She was later seen with several castmates at the 2024 Korean Basketball League All-Star Game.
Yu revealed she was in a relationship with a Single's Inferno 3 castmate in 2026, three years after their season. She later returned to the Miss Korea pageant as a judge.
↑Kwon, Sohee (December 21, 2023). 여기, 천국과 지옥을 오가며 목숨 걸고 사랑할 열두 명이 있다. <솔로지옥 3>의 '사랑 생존 전략'.[Here are twelve people who will go back and forth between heaven and hell and risk their lives to love. < Solo Hell 3>'s 'Love Survival Strategy'.]. Dazed. Retrieved May 6, 2025.
↑Keem, Hyobeen (March 28, 2024). 다채로운 앨리스앤올리비아의 봄으로 물든 시은과 혜선.[The colorful Alice & Olivia's spring-dyed Si-eun and Hye-seon]. Dazed. Retrieved October 5, 2025.
↑Yoo, Soo-kyung (July 29, 2026). "[단독] 유시은♥이관희, 8개월째 열애… '솔로지옥3' 밖에서 연인 된 이유 (인터뷰)"[[Exclusive] Yoo Si-eun♥and Lee Kwan-hee, 8 months of dating... Why we became lovers outside 'Single's Inferno 3' (Interview)]. Hankook Ilbo. Retrieved September 5, 2026.
↑Kim, Ji-woo (July 29, 2026). "'이관희♥' 유시은, 미스코리아 심사위원 됐다…"같은 꿈 꿨는데""['Lee Kwan-hee♥' Yoo Si-eun became a Miss Korea judge... "I had the same dream"]. MyDaily. Retrieved September 5, 2026.