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Park Si Eun (박시은), better known as Sieun, is a South Korean singer and actress currently under High Up Entertainment. She is a member of the girl group STAYC.


2014: Acting debut

Park Si Eun originally made her debut as a child actress in 2014 through the children's television series Pluto Secret Society.

2020: Debut with STAYC

On September 8, 2020, she was revealed as the first member of the girl group STAYC.[1] Her prologue teaser for the group was released on October 13.[2] The group debuted on November 12 with the single album "Star To A Young Culture".



  • Love Forecast (2015)
  • Golden Slumber (2018)

Television dramas

  • Pluto Secret Society (EBS, 2014)
  • Pride and Prejudice (MBC, 2014)
  • Six Flying Dragons (SBS, 2015)
  • Signal (tvN, 2016)
  • The Good Wife (tvN, 2016)
  • The Gentlemen of Wolgyesu Tailor Shop (KBS2, 2016)
  • Queen for Seven Days (KBS2, 2017)
  • Criminal Minds (tvN, 2017)
  • Rain or Shine (JTBC, 2017)
  • Still 17 (SBS, 2018)
  • The Crowned Clown (tvN, 2019)
  • Everything and Nothing (SBS, 2019)
  • Mystic Pop-up Bar (JTBC, 2020)

Reality shows


  • Her father, Park Nam Jung, is a famous singer from the 80s.[1][3]
  • Her favorite girl group is Apink.[4]
  • She is known for resembling Suzy and Park Bo-young.[5]
  • She was a trainee for 4 years.[6]
  • She joined Highup Entertainment in 2019.[6]
  • Her role model is IU.[6]
  • In the group, her designated object is rock.[7]
  • Sieun, Isa, Seeun, and J share a room in the group's dorm.[8]
  • Her MBTI personality type is ENFJ (The Protagonist).[9]
  • Her specialties are singing, playing piano, and speaking English.[10]
  • Her nicknames include Ssini and SingSingi.[11]
  • She has a pet dog named Pomi.[12]
  • Sieun sleeps a lot. Sometimes, she doesn't even hear her alarm going off.[13]
  • Her favorite movie is Titanic.[13]
  • Her dream collaboration would be with Selena Gomez or Ariana Grande.[12]
  • If she wasn't an idol, she thinks she would be a pianist or ballerina as she has been learning those two things since she was 5 years old.[14]


Main article: Sieun (STAYC)/Gallery