Lee Jin-sook (Hangul: 이진숙), better known as Yeoreum (여름), was born on January 10, 1999 (age 21) in Seoul, South Korea. She is the sub-vocalist and sub-rapper of the South Korean-Chinese girl group Cosmic Girls and is a member of its Joy Unit.[1][6]


Yeoreum was raised by her grandparents. Before debut, Yeoreum was a private trainee with Starship Entertainment.[citation needed]

She was revealed to be a member of Cosmic Girls and its Joy Unit on December 17, 2015 and proceeded to debut with the group as sub-vocalist and sub-rapper on February 25, 2018 with their mini-album Would You Like? and single "MoMoMo".[1][4]

She attended SOPA (School Of Performing Arts) until she graduated on February 9, 2018.[7]


Variety ShowsEdit

Year Title Network Notes
2018 Urban Legends KBS with Soobin, Dayoung and Yeonjung[8]


  1. 1.0 1.1 1.2 1.3 1.4 Yeoreum's "MoMoMo" profile.
  2. 2.0 2.1 2.2 Profiles on the Official Website.
  3. Monsta X and WJSN 14 Member Project Group "Y-Teen" Lineup. Kpopmap Retrieved September 27, 2018.
  4. 4.0 4.1 Joy Unit Reveal Teaser Retrieved September 9, 2018.
  5. Dream Your Dream φορεύς Unit teaser.
  6. SeolA and Yeoreum doing the "Of Course" Challenge (0:45)
  7. Idol Graduate from School of Performing Arts Seoul. Soompi Retrieved October 28, 2018.
  8. WJSN joining "Urban Legends"... The Birth of Entertainment? Naver (in Korean). Retrieved September 30, 2018.
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