KISU Biography: Girlfriend, Age, Parents, Height, Net Worth, Songs, K-pop, Events, Nationality

Choi Ki-su, known professionally as KISU (formerly Soo), is a South Korean singer-songwriter and composer best known as the original main vocalist of the K-pop boy group 24K, which debuted in 2012.

After completing his military service and departing from the group, he launched a solo career and has since performed in over 30 countries worldwide, earning recognition for his multilingual covers and heartfelt ballads.

He has also worked as a vocal trainer, music video director, and guide vocalist, establishing himself as an independent artist with a strong international following.

Quick Facts

• Full Name: Choi Ki-su (최기수)
• Stage Name: KISU
• Born: October 2, 1990
• Age: 35 years old
• Birthplace: Seoul, South Korea
• Nationality: South Korean
• Occupation: Singer-songwriter, Composer
• Height: 1.78m
• Parents: Mr. Choi and Mrs. Choi
• Siblings: 1
• Spouse: None
• Children: None
• Relationship: Single
• Net Worth: $500,000

Early Life and Education

Choi Ki-su was born on October 2, 1990, in Seoul, South Korea, to Mr. and Mrs. Choi. He has one older brother.

Choi attended Baekseok Arts University but withdrew due to absences caused by the distance from his home, as he prioritized his growing professional commitments.

His ethnicity is Asian (Korean), and his religion has not been publicly specified. He completed a two-year trainee period before his debut and is known to play the piano in addition to his vocal abilities.

Career

Choi Ki-su began his career as a trainee under Choeun Entertainment, undergoing two years of training before his official debut.

In June 2012, he debuted as a member of the acoustic pop sub-unit 4K alongside Cory, Sungoh, and Seokjune, releasing the single album “Rocking Girl”.

The group name 4K stood for “For Kpop,” and the unit later expanded to a six-member group renamed 24K, with KISU serving as the main vocalist. The group officially debuted in September 2012 with their first mini-album “Hurry Up”.

During his time with 24K, the group struggled to find a steady fanbase and faced frequent lineup changes starting in 2014, though KISU remained an original member throughout his tenure.

In December 2017, while 24K was on hiatus, KISU made his solo debut under the stage name Soo with the album “Sweet Lie”.

He enlisted for his mandatory military service on November 18, 2018, and was discharged on June 19, 2020.

Four months before completing his service, Choeun Entertainment announced his departure from 24K to focus on individual activities. After his discharge, he worked as a vocal trainer, music video director, and guide vocalist.

In January 2021, he rebranded himself as KISU and released the single “Boy” under Beyond ENT, marking the beginning of his independent solo career.

KISU continues to build his career as a global solo artist. Since 2023, he has performed in over 30 countries across Europe, North America, South America, and Asia.

He launched his ambitious “SIDE B” project, a series of covers in which he reinterprets international hits in their original languages, including French, Japanese, Tagalog, Portuguese, and German.

His new single “NUMBERS,” released in April 2026, features the symbolic number “049” meaning “I love you (4) and I thank you (9) forever (0),” a message he has shared with fans since his debut.

He has also participated in the K-Drama in Concert series, performing songs from popular Korean dramas alongside his original work.

Social Media

• Instagram Handle: @1990kisu
• Facebook Handle: KISU (@singerKISU.official)
• Twitter Handle: @1990kisu
• YouTube Channel: KISU
• TikTok Handle: @kisu.049

Personal Life

Choi Ki-su is currently single and has no children. He has kept his personal relationships private, with no public records of past romantic partners.

He maintains a close friendship with Rainbow’s Jisook and Superstar K’s Park Pilgyu.

KISU has spoken openly about the loneliness he sometimes feels while traveling alone as a solo artist, contrasting with his earlier years in a group where he was constantly surrounded by people.

Discography

• Rocking Girl (2012) – with 4K
• Hurry Up (2012) – with 24K
• U R So Cute (2013) – with 24K
• Super Fly (2015) – with 24K
• Still 24K (2016) – with 24K
• Bingo (2016) – with 24K
• Only You (2017) – with 24K
• Sweet Lie (2017) – solo debut as Soo
• Boy (2021) – solo as KISU
• Les planètes (SIDE B Vol. 1) (2025)
• Saiai (SIDE B Vol. 2) (2025)
• Palagi (SIDE B Vol. 3) (2025)
• Daqui pra sempre (SIDE B Vol. 4) (2025)
• C’est la vie (SIDE B Vol. 5) (2025)
• Feuerwerk (SIDE B Vol. 6) (2026)
• NUMBERS (2026)

Net Worth

Choi Ki-su has an estimated net worth of $500,000. His primary sources of income include revenue from his solo music releases, international touring across more than 30 countries, YouTube channel monetization, and brand partnerships.

Additional income comes from his previous work as a vocal trainer, music video director, and guide vocalist, as well as royalties from his work with 24K.