Kim Hyeon Seo

For other people known as 'Hyeonseo', see Hyunseo.

Kim Hyeon Seo

Profile photo for Boys II Planet

Background

Other name(s)

Antonio (안토니오)
Hyeonseo (현서)

Birth name

Antonio Kim
Kim Hyeon-seo (김현서)

Birth date

July 13, 2007 (age 18)

Birth place

United States

Height

175 cm (5 ft 9 in)

Blood type

A

Career

Occupation

Singer

Group debut

October 1, 2021 (Nonstop)

Years active

2021–present

Agency

Jellyfish Entertainment (2025-present)
Future Idol Asia (2020-2022)

Associations

KAILAS
Nonstop
Boys II Planet

SNS

Kim Hyeon Seo (김현서; or simply Hyeonseo; also known as Antonio (안토니오)) is a Korean-American singer under Jellyfish Entertainment. He is a former member of the male crew KAILAS and the project boy group Nonstop.

He is also known for being a contestant on the reality show Boys II Planet.

Career[]

2020–2022: Nonstop, KAILAS[]

On November 21, 2020, Antonio was revealed as a member of Future Idol Asia's first boy group Nonstop as part of the seventh installment of the 'Future Idol Debut Project' which aims to debut various idol groups throughout 2021.^[1]^[2] Later, he was reintroduced as Hyeonseo. He eventually made his debut with the boy group on October 1, 2021, with the release of the digital single, "Fly Away".^[3]

On May 8, 2022, KAILAS opened their Instagram account and revealed Antonio as a member. They presumably disbanded shortly after due to inactivity.

2025-present: Boys II Planet[]

On June 12, 2025, he was officially introduced as a contestant on Boys II Planet, representing Jellyfish Entertainment.^[4] On August 14, he was eliminated in episode 5 after ranking 75th place.^[5]