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Hyungseo (형서) is a South Korean singer under M25. She is a former member of the girl group Busters. She participated on the survival show My Teenage Girl, and ranked 3rd overall, making her a member of CLASS:y.


2017–2020: Busters[]

She debuted as a member of Busters on November 27, 2017 with the group's first single "Dream On".

On March 29, 2020, she posted a letter on their fancafe announcing that she was leaving the group to focus on her studies.

2021–2022: My Teenage Girl, CLASS:y[]

On September 8, Hyungseo was featured in the trailer for the show My Teenage Girl, confirming her participation.[1] For the entrance exam she performed "LATATA" by (G)I-DLE and she received enough votes from the judges to pass.

In the finale, she ranked 3rd overall, making her a member of the girl group CLASS:y.

They debuted on May 5, 2022 with the mini album Class Is Over.

Personal life[]


She attended Hanlim Multi Art School as a student of the Broadcasting & Entertainment Department, graduating on February 7, 2020.[2]



  • Marvel Future Fight OST ("Tonight") (2018)
  • Love Alert OST Part 3 ("Second Crush" with Sang Il) (2018)
  • Marvel Future Fight OST ("I Really Wanna" with Krysta Youngs) (2018)


Web dramas[]

  • A-TEEN 2 (2019) - student
  • Growing Season (2020) - Min Ju

Live action shows[]

  • X-Garion (2019) (from ep.1 to 26) - Egierie Warrior/Shin To-ri

Television shows[]

  • Cooking Class (SBS, 2017) - MC
  • My Teenage Girl (MBC, 2021-2022) - contestant


  • She use to live in Houston, Texas, USA for 6 years.[3]
  • She's fluent in English.[3]
  • She has a Shih Tzu dog named Ribbon.[4]


Main article: Hyungseo/Gallery