|Birthdate||May 16, 2000|
|Birthplace||Seoul, South Korea|
|Current Age||23 Years Old|
|Social Networks||Blog / SHOWROOM / TikTok / Twitter|
|Idol Career Info|
|Debuted||August 2021 / 7.5th Generation|
Lee Siyeon is a member of NMB48's Team M.
- Favorite foods: Rice, donuts, sweets, wagashi (tradiational japanese sweets), donburi
- Hobbies: Eating, singing AKB48 Group songs
- Special skills: Intro quiz (AKB48 Group), japanese
- Future dream: Actress, model
- She auditioned for NMB48's 7th Generation, but due to the pandemic, she couldn't attend the final round in 2020. Therefore she re-auditioned as a 7.5 Gen in March 2021.
- She has been practicing by herself as seen in a video released at NMB48's concert.
- She is the second Korean member of AKB48 Group after SDN48 member Siyeon.
- "I knew I wanted to be in NMB48. I'm aiming to be at the top of the group."
- In August, joined NMB48 as part of their 7.5th Generation.
- On August 14th, participated at the NMB48 LIVE 2021 in Hatsu Natsu ~HATSU NATSU! HATSU RATSU! and opened the concert by performing Yume wa Nigenai solo.
NMB48 Senbatsu Election
- 1st Senbatsu Election - Not Ranked
- NMB48 Kenkyuusei → Team BII Kenkyuusei → Team M
- Joined NMB48 as a Kenkyuusei on August 14, 2021
- Transferred to Team BII Kenkyuusei on February 19, 2022 (NMB48 Team Shuffle 2022)
- Promoted to Team M on July 16, 2022
- BII6 (Namba Egao Kaika Sengen)
- Heart Gata Virus
NMB48 LIVE 2021 in Hatsu Natsu ~HATSU NATSU! HATSU RATSU!~
- Yume wa Nigenai (Solo)
NMB48 12th Anniversary LIVE
- STEP Mushi
- Under Live
- JUMP Mushi
- This is NMB48
| Asao Momoka・Abe Wakana・Lee Siyeon・Uno Mizuki・Kawakami Chihiro・Shiotsuki Keito・Jonishi Rei・Deguchi Yuina|
Nakano Mirai・Hara Karen・Hori Shion・Hongo Yuzuha・Maeda Reiko・Manabe Anju・Mizuta Shiori