Lee Siyeon is a NMB48 Kenkyuusei.
- みんみんみん！みんなの？（しよみーん）みんなと夢見る恋しよう！ 韓国出身、21歳の“しよみん”ことイ・シヨンです！
- Min min min! Min'nano? (Shiyomin) min'na to yumemiru koi shiyou! Kankoku shusshin, 21-sai no “shiyomin” koto Lee Siyeondesu!
- (Min min min! everyone's? (Shiyomin) Let's dream about love with everyone! I'm Lee Siyeon, 21 years old from South Korea!)
- Favorite foods : Rice, donut, sweets, Japanese sweets
- Favorite animals : Ostrich
- Hobbies : Eating, singing AKB48 Group songs
- Special skills : Intro quiz (AKB48 Group), Japanese
- Future dreams : Actress, model
- Favorite 48G members: Ota Aika, Watanabe Mayu, Yamamoto Ayaka
- She auditioned for 7th Gen, but due to the pandemic she couldn't attend the final round in 2020. Therefore she re-auditioned for 7.5 Gen in March 2021.
- She has been practicing by herself as seen in a video released at NMB48's concert.
- Is the second Korean member of AKB48 Group after SDN48 member, Siyeon.