Lee attended a wedding ceremony with her non-celebrity boyfriend, who is an alumnus of Seoul National University and had a wedding at the end of June 2021.[3]
^Kang Nae-ri (July 5, 2022). "오정연·안우연·이시원 등 배우8인, 이엘파크와 전속계약(공식)" [8 actors including Oh Jeong-yeon, Ahn Woo-yeon, and Lee Si-won, signed an exclusive contract with EL Park (official)] (in Korean). YTN. Archived from the original on July 5, 2022. Retrieved July 5, 2022 – via Naver.
^Ryu, Ye-ji (June 23, 2022). "서울대 의사 남편♥' 이시원, '아다마스' 합류...지성·서지혜와 호흡" [Seoul National University Doctor Husband♥' Lee Si-won joins 'Adamas'... Breathing with Ji-sung and Seo Ji-hye] (in Korean). Ten Asia. Archived from the original on June 23, 2022. Retrieved June 23, 2022 – via Naver.
^Jang Woo-young (May 25, 2022). "[단독] 서울대 출신 엄친딸 등판...이시원, '랜선뷰티' 출연" [[Exclusive] My mother-daughter from Seoul National University debuts... Siwon Lee to appear in 'Lan Sun Beauty'] (in Korean). OSEN. Archived from the original on May 25, 2022. Retrieved May 25, 2022 – via Naver.
^Bae Hyo-joo (September 15, 2022). "서울대 출신 이시원 "동문 남편 덕에 결혼 선입견 깨져..비키니도 입으며 자유롭게" [Siwon Lee, a graduate of Seoul National University, "Because of my alumni husband, my preconceived notions about marriage have been broken... freely wearing a bikini"] (in Korean). Newsen. Archived from the original on September 15, 2022. Retrieved September 15, 2022 – via Naver.
^Kang, Min-kyung (July 26, 2023). "[공식] 하석진→이혜성·세븐틴 승관, 일주일 동안5억 두고 싸운다('데블스 플랜')" [[Official] Ha Seok-jin → Lee Hye-sung and Seventeen Seung-kwan will fight for 500 million won for a week ('Devils Plan')] (in Korean). Ten Asia. Retrieved August 5, 2023 – via Naver.
