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Yook Sungjae (육성재; or Sungjae) is a South Korean singer and actor under Cube Entertainment. He is the maknae of the boy group BTOB and its sub-unit BTOB-BLUE.


2019-2020: 3X2=6 Project and Yook O'clock

On December 20, 2019, a teaser photo was released on the BTOB twitter teasing the single "3X2=6 Part 1".[1] The single was to be a part of his single project where he was to release two songs every month for 3 months. The next day, teaser photos of him in the studio were released.[2] On the 23rd, the track list was released with the audio teasers being released on the 24th.[3][4] The single and the lyric video was officially released on the 26th and 27th respectively.[5]

A teaser photo displaying the date "4/6" was released on January 8, 2020 with another being released on the 10th.[6][7] The track list for "3X2=6 Part 2" was revealed on the 13th with the audio teasers being released on the 15th.[8][9] The single was released on the 16th with the lyric videos for the songs being released the next day.[10][11]

A teaser photo displaying "6/6" was released on February 1.[12] The track list was released on the 4th with the audio teasers being released the next day.[13][14] The single "3X2=6 Part 3" was released on the 6th with the lyric videos being released on the next day.[15]

On February 17, it was announced that he will be releasing the special album Yook O'clock on March 2.[16]

Personal life

Military service

On May 3, 2020, he announced on his Instagram that he will be enlisting on May 11 as an active duty soldier along with fellow member Lim Hyunsik.[17][18] He was early discharged on September 26, 2021[19] and officially discharged on November 14.[20]


Special albums

Digital singles



  • Louie - "On the Four Lane Road" (2016)
  • Jung Key - "Stay With Me" (2018)


Other releases

  • "King of Mask Singer Episode 12" ("One Day Long Ago") (2015)
  • "Fantastic Duo 2 Part.11" ("Memory Loss" with Gummy) (2017)




  • Gmarket (2015)
  • Mamonde (2016)
  • BLACK YAK (2016)
  • Overwatch (2017)
  • THERMOS (2017)
  • AkiiClassic (2017)
  • Fitz (with Joy) (2018)
  • yanolja (2018)
  • Dongji cold noodles (2016)
  • SOMEBYMI (2019)


  • His MBTI personality type is ENTP.[21]


Main article: Yook Sungjae/Gallery


  1. Allkpop: BTOB's Sungjae reveals teaser image for solo project single '3X2=6 Part 1'
  2. Allkpop: BTOB's Sungjae reveals in-studio teaser images for single project '3X2=6 Part 1'
  3. Allkpop: BTOB's Sungjae unveils tracklist for his end-of-year single album '3 X 2 = 6'
  4. Allkpop: BTOB's Sungjae reveals audio teasers for 'From Winter' & title song 'Yook'
  5. Allkpop: BTOB’s Sungjae releases digital single '3 X 2 = 6 Part 1'
  6. Allkpop: BTOB's Sungjae reveals night city teaser image for '4/6'
  7. Allkpop: BTOB's Sungjae drops neon teaser image for '3X2=6 Part 2'
  8. Allkpop: BTOB's Sungjae reveals neon track list for '3X2=6 Part 2'
  9. Allkpop: BTOB's Sungjae teases upcoming tracks 'W.A.U' & 'Chicken'
  10. Allkpop: BTOB's Sungjae drops his tracks 'W.A.U' & 'Chicken'
  11. Allkpop: BTOB's Sungjae drops lyric MVs for 'W.A.U' & 'Chicken'
  12. Allkpop: BTOB's Sungjae teases final part of '3X2=6' project series
  13. Allkpop: BTOB's Sungjae reveals track list for '3X2=6' part 3
  14. Allkpop: BTOB's Sungjae reveals audio teasers for '3X2=6' part 3
  15. Allkpop: BTOB's Sungjae drops last 2 tracks for '3X2=6'
  16. Soompi: BTOB’s Yook Sungjae To Release Solo Album
  17. Soompi: BTOB’s Yook Sungjae Announces Military Enlistment Date
  18. Soompi: BTOB’s Hyunsik And Yook Sungjae To Enlist In The Military On The Same Day
  19. Soompi: BTOB’s Yook Sungjae Updates Fans On His Status After Early Discharge From Military Service
  20. Soompi: BTOB's Yook Sungjae And Hyunsik, PENTAGON's Jinho Officially Discharged From The Military Today
  21. Allkpop: K-Pop idols who have revealed their MBTI

Official links