STC Members Profile and Facts

STC (에스티씨) is a South Korean pre-debut boy group under K&Y Entertainment, consisting of 5 members: Donghyeon, Hyoya, Minsung, Kangmin, and Sihyeon. On May 30, 2026, it was announced that LEE&KIM (Donghyeon and Hyoya) and 4SEASON members Kangmin and Sihyeon would form a 4-member group together. They began promotions in Japan on June 19 with their STC : Start The Cycle live shows. They made their Japanese debut on October 9, 2026, with the single album START THE CYCLE.

Group Name Meaning: It’s an abbreviation of Start The Cycle, which symbolizes their new beginning as a team.
Official Greeting: “Hello, we are STC” (こんにちはSTCです/ 안녕하세요 STC입니다)

STC Official Fandom Name: N/A
Fandom Name Meaning: N/A
STC Official Color(s): N/A

STC Official Logo:

Official SNS:
Instagram: @s_t_c_official (KR)/ @stc_official.japan (JP)

STC Member Profiles:
Donghyeon

Stage Name: Donghyeon (동현)
Birth Name: Lee Dong Hyeon (이동현)
Position(s): N/A
Birthday: April 28, 1991
Zodiac Sign: Taurus
Chinese Zodiac Sign: Sheep
Height: 184 cm (6’0″)
Weight: 74 kg (163 lbs)
Blood Type: AB
MBTI Type: ENFP
Nationality: Korean
Instagram: @hello__0428
TikTok: @hello_donghyeon
X: @qweasd7777/ @TaeFung428
YouTube: 동현이에요/ Donghyeon Lee

Donghyeon Facts:
– He was born in Seoul, South Korea.
– He is also a member of LUKUS (2013-present) (although their current status is unclear, they have not officially disbanded).
– Donghyeon is a former member of X-5 (2011-2012) and LEE&KIM (2024-2026).
– He previously went by the stage name Taefung (태풍).
– He’s a former FNC Entertainment trainee.
– Donghyeon made his solo debut on June 29, 2020, with the single “if i could meet you again”.
– He acted in the dramas Miss Ripley (2011), Spy Myeong Wol (2011), and the movie Bear Man (2023).
– He took part in writing and/ or producing of all of his solo releases, LEE&KIM‘s debut single “STARLIGHT”, and “MY LOVE” by LU4US.
– Donghyeon announced his marriage in May 2024.
– Education: Digital Seoul Culture Arts University (Department of Urban Environment Art, Bachelor’s degree)
– He has a pet dog named Choco (초코).
– He appeared in a commercial for a beverage brand.
– Donghyeon liked soccer from a young age and originally dreamed of becoming a professional soccer player, but had to give up that dream due to an injury. After watching High Kick!, he became interested in acting and naturally developed a dream of becoming a singer.
– He’s close with F.CUZ‘s LeeU, NTB‘s Zio and Sungwoong, UKISS‘ Soohyun, and XENEX‘s Heeseok.
– His role model is Lee Minho.
– He used to practice Taekkyon (a traditional Korean martial art).
– His specialties are crawling and doing push-ups with his arms rotated, doing a voice impression of Park Younggyu, and a vocal impression of a broken Ajaeng (traditional musical instrument).

Hyoya

Stage Name: Hyoya (효야)
Birth Name: Kim Jong Hyo (김종효)
Position(s): N/A
Birthday: June 5, 1992
Zodiac Sign: Gemini
Chinese Zodiac Sign: Monkey
Height: 178 cm (5’10”)
Weight: 67 kg (147 lbs)
Blood Type: AB
MBTI Type: N/A
Nationality: Korean
Instagram: @jonghyokim9
X: @jonghyokim9
YouTube: 효야 HYOYA

Hyoya Facts:
– He was born in Busan, South Korea.
– He is also a member of LUKUS (2020-present) (although their current status is unclear, they have not officially disbanded).
– Hyoya is a former member of LC9 (2013-2015), CIRCUS CRAZY (2015-2018), and LEE&KIM (2024-2026).
– He formerly went by the stage names J-Hyo (제이효) and Kizo (키조).
– He wrote the lyrics for both tracks on STC‘s Japanese debut single album START THE CYCLE, and took part in writing LEE&KIM‘s debut single “STARLIGHT” and “MY LOVE” by LU4US.
– Hyoya is a former FNC Entertainment trainee and trained with FTISLAND.
– He acted in the short drama Lies of Spring (2017).
– He starred in the music video for “DIRTY” by MIRYO and “Call My Name” by Lee Yurim.
– Hyoya completed his military service from September 2018 to 2020.
– Education: School of Performing Arts Seoul
– He has an older sister.
– His specialties are playing the guitar, his strong vocals, rapping, and English skills.
– He likes reading books.

Minsung

Stage Name: Minsung (민성)
Birth Name: Kim Jun Hoe (김준회), legalized to Kim Min Sung (김민성)
Position(s): N/A
Birthday: October 26, 1995
Zodiac Sign: Scorpio
Chinese Zodiac Sign: Pig
Height: 177 cm (5’10”)
Weight: 58 kg (128 lbs)
Blood Type: B
MBTI Type: N/A
Nationality: Korean
Instagram: @mlnsxxg
TikTok: @minsung_k

Minsung Facts:
– He was born in Cheongju, North Chungcheong Province, South Korea.
– He was revealed as a new member on September 12, 2026.
– Minsung is a soloist under ADVANTAGE. He made his solo debut on January 31, 2022 with the digital single “Tonight”.
– He’s a former member of VARSITY (2016-2020), New World, Rion Five (2019), Ten-X (2020), and the project group URSA MAJOR (2023).
– Minsung went by the stage name Kid (키드) in VARSITY.
– He participated in MIXNINE (2017), where he ranked 48th, and Show King Night (2023). He also auditioned for PEAK TIME (2023) as an individual trainee for a spot in Team 24:00, but was unsuccessful.
– Education: Daekyeung University (Practical Dance Department, Associate Degree)
– He trained for about 6 years before making his initial debut.
– He owned his own clothing brand called Li:youngpm.
– Minsung writes all of his own music.
– He is close friends with former INX and Y&W member Koo Bonkuk.
– His favorite artists are Michael Jackson and Usher.
– His specialty is playing the piano.
– Minsung’s nicknames are “Tsundere”, “Ace” (referring to the One Piece character), “Jjune”, and “Ice Prince”.
– His habits are touching his hair and nose.
– His favorite food is samgyeopsal (pork belly).
– Motto: “Let’s do our best.”

Kangmin

Stage Name: Kangmin (강민)
Birth Name: Kang Min Seok (강민석)
Position(s): N/A
Birthday: October 21, 1996
Zodiac Sign: Libra
Chinese Zodiac Sign: Rat
Height: 174 cm (5’9″)
Weight: 54 kg (119 lbs)
Blood Type: AB
MBTI Type: INFJ
Nationality: Korean
Instagram: @illxlllolll

Kangmin Facts:
– He was born in Cheongju, North Chungcheong Province, South Korea.
– He’s a former member of A to Z (2017), VARSITY (2017-2020), and 4SEASON (2025-2026).
– Kangmin previously went by the stage names Xiweol (시월) and Minhyun (민현).
– He was formerly under DH Entertainment, AK Entertainment, and A+ Entertainment (2024-2026).
– He has completed his military service.
– Kangmin was featured on KOVI‘s single “Teach me”.
– He has his own brand called LOEWIX.
– He previously ran a reaction YouTube channel called Xiweol Show, which was later rebranded as PoP World and co-hosted with Sihyeon. The channel appears to have since been deleted.
– Education: High school (Graduated September 3, 2017), Korea University of Media Arts (Practical Music Department, graduated), Seoul Digital University (Computer Engineering Major, graduated)
– He has a brother.
– He was a performer at the M Countdown KPOP Concert in Thailand and appeared on MBC’s Sports Festival Program.
– Kangmin was awarded the Hanpi Cultural Gold Award.
– His specialties are playing the piano and guitar.
– His hobbies are running, singing, and soccer.
– Kangmin’s favorite singers are Park Hyoshin and BTOB‘s Sungjae.
– His favorite food is pizza, hamburgers, chicken, samgyeopsal (pork belly), and donkatsu.
– His ideal type is someone who is cute.
– Motto: “Let’s live carefully every day.”

Sihyeon

Stage Name: Sihyeon (시현)
Birth Name: Nam Kwon Hee (남권희)
Position(s): Maknae
Birthday: March 17, 1997
Zodiac Sign: Pisces
Chinese Zodiac Sign: Ox
Height: N/A
Weight: N/A
Blood Type: AB
MBTI Type: N/A
Nationality: Korean
Instagram: @xixxyeon_

Sihyeon Facts:
– He’s a former member of SOLUTION (2019), MOUNTAIN (2019-2020), and 4SEASON (2025-2026).
– He romanized his stage name as Sihyun during his time in 4SEASON.
– Sihyeon was formerly under DH Entertainment, AK Entertainment, and A+ Entertainment.
– He was awarded the Chungbuk Song Festival Grand Prize.
– He previously ran the reaction YouTube channel PoP World which he co-hosted with Kangmin, but the channel appears to have since been deleted.
– His nickname is “Kkeopdegi” (grilled pork skin).
– His specialties are arm wrestling and singing.
– Sihyeon’s hobbies are exercising, traveling, and gaming.
– His charming point is his ability to be both cute and serious.
– His favorite artist is Park Hyoshin.
– Sihyeon’s favorite song is “Bubble Love” (artist not specified).
– His favorite drama and movie genre is time-slip.
– He’s scared of ghosts.
– Things he would like to try someday include composing music and skydiving.
– When he met his fans for the first time, he felt like it was unreal and was determined to work even harder to not disappoint them.
– One word he uses to describe himself is “Fighting”.
– Motto: “If you start something, make sure to see it through to the end!”

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Who is your STC bias? Do you know more facts about them? Feel free to comment below!