MASC: Profile, Facts, Future Plans, Etc.

All The Things You Need to Know About The Boy Group MASC

Whether you’re an old or a new fan, there will always be so many groups to discover in the K-Pop realm. In fact, this is what makes the K-Pop world so exciting! Every day you can discover and find new groups to idolize!

This time, we want to shed some light on a K-Pop boy group called MASC that debuted in 2016 under J Planet Entertainment. Are you ready for their facts and surprises? Scroll down this article below to fall in love with them!


Group Profile

Now, there is a saying that goes something like: “Don’t know equals no love.” So, before we start our dive into the members and facts, let’s get to know the group first!

Starting out as a four-member group, boy band MASC (Korean: 마스크) debuted on August 19th, 2016, under J Planet Entertainment. Originally, the band debuted with members Woosoo, 26, ACE, and Heejae with the release of the mini-album Strange (2016).

After that, they began to release photo teasers for their next comeback on January 20th, 2017, followed by their first single titled “Tina” that was officially released on February 4th, 2017. Then in September the same year, MASC announced that they will be making a comeback as an 8-member group. The group’s extension to 8 members was due to the addition of 4 new members: Doeun, Ireah, Moonbong, and Chibin. After releasing each of the 8 members’ teaser images and teaser videos, they finally made a comeback by releasing their second single “Do It” which was officially launched on October 12th, 2017.

Unfortunately, the 8-members formation didn’t last long. In late July 2018, members ACE and Chibin left the group due to physical assault controversies involving the two members. Soon after, member 26 also left the group to build and pursue his career in the film industry, and Doeun left due to personal reasons.


Birth Name: Woo Young-soo
Stage Name: Woosoo (우수)
Date of Birth: September 5th, 1989
Place of Birth: Busan, South Korea
Position: Leader, Main Vocal
Height: 176 cm
Weight: 60 kg
Blood Type: B
Zodiac: Virgo
Instagram: @w_youngsoo
Twitter: @wys1989
Youtube: WooSoo

Interesting Facts:

  • Woosoo is a former member of E-7 (debuted in 2012 and disbanded in 2014)
  • His hobby is writing lyrics
  • He really likes sikye (a typical Korean drink made from rice fermented with yeast flour)
  • He also likes Korean popcorn
  • He is quite good at playing soccer
  • His favorite artists are Maroon 5 and Bruno Mars
  • His talents include high notes and singing various songs in the R&B style
  • He is a good friend of U-Kwon (Block B)
  • He doesn’t like soda and coffee
  • His stage name means “Excellent”
  • He once won a Badminton sports competition in Japan


Birth Name: Yoo Hee-jae
Stage Name: Heejae (희재)
Date of Birth: February 22nd, 1995
Place of Birth: South Korea
Position: Vocal
Height: 175 cm
Weight: 62 kg
Zodiac: Pisces
Instagram: @heeeeeejae


Interesting Facts:

  • Initially, he was the youngest member of the group before MASC added 4 new members
  • He studied at KayWon High School and Seoul Institute of the Arts
  • His favorite color is white
  • His favorite food is rice
  • He doesn’t really like sweets
  • His date of birth is the same as group-mate 26 (Yi-Ryuk)
  • Since high school, he has appeared in musical dramas several times


Birth Name: Lee Jong-hee
Stage Name: Ireah (이레)
Date of Birth: March 25th, 1994
Height: 174 cm (5’9″)
Weight: 63 kg (139 lbs)
Zodiac: Aries

Interesting Facts:

  • He joined MASC on September 12th, 2017
  • He has a brother
  • His specialty: composing
  • His hobby is cooking
  • His favorite foods are sushi and all the edible food
  • He has aquaphobia (fear of water) and acrophobia (fear of heights). (via Pops in Seoul)
  • He likes dogs, he would like to have a Pomeranian
  • His motto is: “A different perspective changes the world.”


Birth Name: Song Moon-bong
Stage Name: Moonbong (문봉)
Date of Birth: July 8th, 1998
Position: Vocalist, Visual, Maknae
Height: 174 cm (5’9″)
Zodiac Sign: Cancer
Instagram: @door.b
Twitter: @doorb7887
Youtube: Moonbong

Interesting Facts:

  • He joined MASC on September 12th, 2017
  • He has 5 family members including his mom, dad, and 3 siblings
  • He enjoys makeup
  • His specialty is singing
  • His hobbies are watching movies and shopping
  • His favorite foods are meat, tonkatsu, spaghetti, and chicken
  • His motto is: “Don’t regret anything!”


Former Members: Daesung
Birth Name: Kim Dae-sung
Stage Name: Ace
Date of Birth: May 11th, 1990
Place of Birth: Seoul, South Korea
Position: Rap, Vocal, Dancer
Height: 176 cm
Blood Type: –
Zodiac: Taurus
Instagram: @aceseaaiite

Interesting Facts:

  • He is from Seoul
  • He is a former child actor
  • Previously, he was a member of the underground rap crew named Rassay Sunz
  • Hee debuted as an actor in 2004 through the film Spirit Of Jeet Keun Do
  • He has also played in TV dramas several times, such as Sharp 3 (2006, KBS), Blissful Woman (2007, KBS2), and One Warm Word (2013, SBS)
  • He studied at Dankook University
  • His favorite foods are jjolmyeon, meat, and spicy noodles
  • He is a good friend of BTOB’s Minhyuk
  • He is also friends with Hanbyul (ex-LEDAplle) because they used to be in the same agency
  • He has a dog named Yammi which is published through his Instagram account
  • He has talent in writing lyrics and composing songs



Stage Name: Chibin (치빈)
Birth Name: Jeon Chibin (전치빈)
Position: –
Date of Birth: January 14th, 1998
Height: 176 cm (5’9″)
Weight: 57 kg (126 lbs)
Zodiac: Capricorn
Instagram: @grambin_

Interesting Facts:

  • He was part of the new member addition along with Doeun, Ireah, and Moonbong
  • He was introduced to the public on September 12th, 2017
  • His specialty is playing the piano and running
  • His hobbies are watching movies alone and walking on a dark road once in a while
  • His favorite foods are pizza, chicken, and french fries
  • His motto is: “Let’s stay true to our feelings!”
  • On July 25th, 2018, he left a post on his Instagram confessing that 5 months ago, he was brutally attacked and injured by one of his band members (ACE)
  • On July 30th, 2018, MASC’s agency announced that Chibin (who has been resting as he receives treatment for his mental trauma) stated that he finds it difficult to continue activities as a member of MASC
  • Since then, he decided to prepare for college and change his career path to acting



Stage Name: 26/Yiryuk (이륙)
Birth Name: Kim Ji-hoon (김지훈)
Position: Rapper, Dancer
Date of Birth: February 22nd, 1990
Zodiac Sign: Pisces
Height: 178 cm (5’10″)
Weight: 58 kg (128 lbs)
Blood Type: A
Nationality: Korean
Instagram: @j1hoon_k
Twitter: @KayJi90

Interesting Facts:

  • He was the second member to be revealed after ACE
  • His stage name is read Yi-Ryuk
  • He studied directing at Seoul Institute of the Arts
  • He was a choreographer and former street dancer
  • His favorite color is black
  • His favorite foods are ramen and pizza
  • He has 2 cats named Ro and Elly
  • He has the same date and month of birth as group-mate Heejae
  • He was responsible for the production of the music video for MASC’s debut song
  • He directed girl group Veloce’s MVs, indie films, commercials, and web-dramas
  • His specialty is a certified sports massage therapist
  • In middle school, he was a track and field athlete
  • He, along with Woosoo, A.C.E, and Heejae appeared in a K-drama titled The Miracle (episode 4)
  • On July 30th, 2018, he revealed on his Instagram that he left MASC to pursue the path of becoming a film director
  • He posted on his Instagram that he is in a relationship



Stage Name: Doeun (도은)
Real Name: Kim Doeun (김도은)
Position: –
Date of Birth: June 4th, 1993
Zodiac Sign: Gemini
Height: 183 cm (6’0″)
Weight: 75 kg (165 lbs)
Instagram: @doeungram
Youtube: DOEUNI__


Interesting Facts:

  • He joined MASC on September 12th, 2017
  • His specialties are Taekwondo and Japanese
  • His hobbies are drawing, playing the piano, playing soccer
  • His favorite foods are chicken breast, eggs, bread, and snacks
  • His motto is: “Be always modest, but don’t be servile!”
  • In October 2018 it was announced that he left the band due to personal reasons