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TST Members Profile

TST Members Profile: TST Facts

TST (일급비밀), formerly known as 7STONE and TopSecret, was a Korean boy group that, in the last part of their career, consisted of 4 members: Ain, K, Wooyoung, and Yonghyeon. The group debuted on January 1st, 2017, under JSL Company (which later changed its name to KJ Music Entertainment), with the mini album “Time’s Up“. They are presumably disbanded due to inactivity since 2020.

TST Fandom Name: HANA (하나)
TST Official Color:

TST Official Accounts:
Twitter: @FS7_official
Facebook: officialFS7
Instagram: @fs7official
Fan Cafe: Daum Cafe
YouTube: 일급비밀 TST Official

TST Members Profile:

Stage Name: Ain (아인)
Birth Name: Kim A In (김아인)
Position: Leader, Main Dancer, Vocalist
Birthday: February 15, 1994
Zodiac Sign: Aquarius
Height: 182 cm (6’0″)
Weight: 64 kg (141 lbs)
Blood Type: O
Twitter: @AIN8008
Instagram: @ainismxx
Instagram (shared with Yohan): @yoio505
Youtube (shared with Yohan): YO-I요아이

Ain Facts:
– He was born in Asan, Chungcheong, South Korea.
– He has a younger sister.
– He went to a JYP Entertainment audition but didn’t make it.
– His specialty is choreography.
– Before debut, he used to be a dance teacher.
– His favorite food is Tonkatsu.
– He likes ice cream, especially the blueberry and cheese flavors
– He dislikes marshmellows.
– His favorite colors are red and purple.
– He is a fan of Wonder Girls, EXOand Big Bang.
– He is a former member of NOM.
– Ain enlisted in the military on April 6th, 2020.

K TopSecret
Stage Name: K (케이)
Birth Name: Kim Hyeong In (김형인)
Position: Lead Vocalist
Birthday: May 6, 1991
Zodiac Sign: Taurus
Height: 178 cm (5’10″)
Weight: 63 kg (139 lbs)
Blood Type: AB
Twitter: @ghn5613
Instagram: @seo_yuan
Youtube: Klog

K Facts:
– He was born in Gwangju, South Korea.
He has an older brother.
– He speaks English.
– His favorite color is white.
– He is not picky when it comes to food. There’s no food he doesn’t like.
– His favorite food is corn.
– He loves shopping.
– He can knit.
– He often has insomnia.
– The reason why he became a singer is because he feels excited when he’s on stage and that he loves music and dancing too much, he cannot hide it.
– He’s a fan of Super Junior.
– He is a former member of NOM.
– K has his own brand called Mellow Wolf.
– K enlisted in the military on March 21, 2019.
– He made his solo debut on April 10, 2021, with the digital single ‘Missing You’.
– K and U-kiss Member Kiseop have created a restaurant named ‘으악생’. (CR Nugupromo on X)
K’s ideal type: is a girl with beautiful eyes.

Wooyoung TopSecret
Stage Name: Wooyoung (우영)
Birth Name: Choi Woo Yeong (최우영)
Position: Lead Dancer, Vocalist, Rapper
Birthday: May 14, 1996
Zodiac Sign: Taurus
Height: 178 cm (5’10″)
Weight: 60 kg (132 lbs)
Blood Type: A
Instagram: @wy0514

Wooyoung Facts:
– Wooyoung describes himself as sexy, cute and charming.
– He can speak English.
– Wooyoung’s English name is Danny Choi.
– He studied in California for 7 years, which is why he’s fluent in English.
– Wooyoung’s favorite food is Korean chicken.
– His good luck charm is a bracelet.
– Wooyoung is not participating in this comeback due to body discomfort.


Stage Name: Yonghyeon (용현)
Birth Name: Kwon Yong Hyeon (권용현)
Position: Main Vocalist, Maknae
Birthday: December 18, 1996
Zodiac Sign: Sagittarius
Height: 175 cm (5’9″)
Weight: 58 kg (128 lbs)
Blood Type: AB
Instagram: @yyyyyyonggg

Yonghyeon Facts:
– He was born in Busan, South Korea.
– In 2023 he signed with Nature Space Entertainment.
– He debuted as a soloist, under the stage name UO, on April 6, 2023 with the single album “Restart.
On July 26, 2023 he was announced as a new member of XEED.
Show more Yonghyeon / UO facts…

Member for Eternity:

Stage Name: Yohan (요한)
Birth Name: Kim Jung Hwan (김정환)
Position: Vocalist
Birthday: April 16, 1992
Height: Aries
Height: 180 cm (5’11″)
Weight: 64 kg (141 lbs)
Blood Type: O
Twitter: @K_jeonghwan
Instagram: @yohanee0416
Instagram (shared with Ain): @yoio505
Youtube (shared with Ain): YO-I요아이

Yohan Facts:
– He was born in Ulsan, South Korea.
– He can play the drums and the piano.
– He’s a fan of various boy groups like Vixx, B.A.P, BTOB, INFINITE
– His hobby is watching movies.
– He is not a good swimmer.
– He likes animals.
– He can beatbox and play the piano.
– According to Ain, Yohan is the best cook in the group
– He is a former member of NOM
– On June 16, 2020 it was announced that Yohan unfortunately passed away, at age 28. The cause of death wasn’t revealed.

Former Member:

Stage Name: Junghoon (정훈)
Birth Name: Lee Jung Hoon (이정훈)
Position: Rapper
Birthday: October 18, 1996
Zodiac Sign: Libra
Height: 175 cm (5’9″)
Weight: 58 kg (128 lbs)
Blood Type: AB
Instagram: @hoon2_jung

Junghoon Facts:
– Junghoon participated on “The Unit” and passed the auditions but was eliminated after the 1st round, where he performed Block B’s “HER”.
– On October 16, 2020 he announced that he left TST and he opened a Youtube channel (HoonheeTV) with his girlfriend.

Kyeongha TopSecret
Stage Name: Kyeongha (경하)
Birth Name: Lee Kyeong Ha (이경하)
Position: Rapper, Maknae
Birthday: August 3, 1998
Zodiac Sign: Leo
Height: 174 cm (5’9″)
Weight: 57 kg (126 lbs)
Blood Type: O
Instagram @kyeongha0803

Kyeongha Facts:
– Kyeongha participated on “The Unit” and passed the auditions but was eliminated after the 1st round, where he performed Seventeen’s ‘Boom Boom’.
– Kyeongha made friends with Topp Doggs B-Joo while they were in the ‘Boom Boom’ team.
– In May 2018, Kyungha was sentenced to 18 months in jail and 3 years of probation after confessing to sexual harassment charges that occurred in 2014.
– On May 11, 2018 it was announced that Kyeongha is leaving the band because he doesn’t want to harm his group, who were suffering due to their promotions being suspended.
Kyeongha’s ideal type is someone like Apink’s Son Na-Eun “Lovely image but has a boyish charm at the same time”.

Note: More facts to be added once they are available.

(Special thanks to ~Kratos~, Shain, ~Kookie, Adlea, Markiemin, ninetailgumiho, Elina, m i n e l l e, Hye ♡, Markiemin, Ka-ching, SAAY, TSTgurl, arii, xoyeolfiexo, suga.topia, ~Yume~, Morgan, ↬sadistic.banana, Hirakocchi, vero, chelseappotter, martinka, Chrissi Harder, martinka, Aden M.)

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