Jeong In Seong

Profile photo for Build Up : Vocal Boy Group Survivor

Background

Birth name

Jeong In-seong (정인성)

Birth date

July 1, 1994 (age 30)

Birth place

Gangdong-gu, Seoul, South Korea

Height

183 cm (6 ft 0 in)

Weight

71 kg (157 lb)

Blood type

A

Career

Occupation

Singer

Instruments

Piano

Group debut

March 3, 2016

Solo debut

October 30, 2023

Years active

2012–present

Agency

220 Entertainment (2018–present)
Universal Music Japan (Japan; 2018–present)
YNB Entertainment (2016–2018)

Associations

KNK
MIXNINE
Build Up : Vocal Boy Group Survivor

SNS

Jeong In Seong (정인성) is a South Korean singer under 220 Entertainment. He is the main vocalist of the boy group KNK.

He is best known for being a contestant on the reality survival show MIXNINE and Build Up : Vocal Boy Group Survivor.

He made his solo debut on October 30, 2023 with the digital single "Trust Yourself".^[1]

Career

Pre-debut

This article or section is missing sources and may contain inaccurate and unverified info. Please help by adding appropriate references.

Along with Seungjun, he was a former Big Hit Entertainment trainee where they both trained with the members of the boy group BTS.

Upon moving to FNC Entertainment, he appeared as one of the trainees in its reality show Cheongdam-dong 111 along with Heejun in 2013.

Before debuting with KNK, he was a backup dancer for the live performances of BESTie's "I Need You".

2024: Build Up : Vocal Boy Group Survivor

In January 2024, he was revealed as a contestant on Mnet's reality survival show Build Up : Vocal Boy Group Survivor.^[2]

2025: "일기쓰는남자"

On December 19, 2024, it was reported that Jeong In Seong was casted in the musical "일기쓰는남자" as Lee Moji and would appear on stage on February 18-22, 2025 at Gwangmyeong Civic Center Grand Concert Hall.^[3]

Personal life

Military service

On January 13, 2022, 220 Entertainment announced that Jeong In Seong would be enlisting on February 8.^[4] He was discharged on August 7, 2023.^[5]

Discography

Digital singles

"Trust Yourself" (2023)
"First Time Back Then" (2024)

Filmography

Reality shows

Cheongdam-dong 111 (2013)
MIXNINE (JTBC, 2017–2018) - contestant
Build Up : Vocal Boy Group Survivor (Mnet, 2024) - contestant

Variety shows

Let's Go! Dream Team Season 2 (2016)
Duet Song Festival (2016) - contestant with Kim Wan Sun
Hello Counselor (2016)
Hitmaker Season 3 (2017)

Music video appearances

2AM – "You Wouldn't Answer My Calls" (Japanese Ver.) (2012)
BESTie – "Excuse Me" (2015)

Gallery

Main article: Jeong In Seong/Gallery

References

Official links

Instagram

This article is a stub. You can help Kpop Wiki by expanding it.

[1] (KR) News1: 크나큰 정인성, 데뷔 7년만 솔로 데뷔..30일 신곡 '밤의 의미' 발매

[2] Soompi: Mnet's New Vocal Survival Show "Build Up" Unveils All 40 Contestants

[3] @KNKOfficial220 on Twitter (December 19, 2024)

[4] Soompi: KNK Announces Oh Heejun’s Departure From Group And Jeong Inseong’s Military Enlistment In February

[5] @KNKOfficial220 on Twitter (August 7, 2023)

[1]

[2]

[3]

[4]

[5]