Ji Hyun-woo (born Joo Hyung-tae on 29 November 1984) is a South Korean actor and musician.

Then in 2004, he along with Park Joon-shik (vocals) and Kim Hyun-joong (bass) formed rock band The Nuts.

In 2005 Ji played Danny Zuko in a Korean staging of the musical Grease, which released its cast recording.

[12] Ji continued to star on the small and big screen, among them the TV dramas Golden Apple (2005),[13] Over the Rainbow (2006),[14] Merry Mary (2007),[15] My Sweet Seoul (2008),[16] My Precious You (2008),[6] Invincible Lee Pyung Kang (2009),[17][18] Becoming a Billionaire (2010),[19] and A Thousand Kisses (2011).

[23] He was one of the season 2 hosts of Invincible Youth, a variety program based on members of popular girl groups experiencing the rural countryside of Korea.

He was due to enlist in July but it was delayed for one month while he recovered from a back injury suffered during the filming of Queen and I.

It was co-produced by the Ministry of National Defense and Korea Musical Theatre Association, to commemorate the 60th anniversary of the signing of the armistice.

Running from 9 to 20 January at the National Theater of Korea, the musical is centered around a group of soldiers who keeps a promise made to each other during the 6.25 war.

[34] A major turning point in Ji's career followed as the protagonist of the critically acclaimed cable series Songgot: The Piercer, a webtoon adaptation that tackled social injustice when temps are laid off by a big-box store.

[citation needed] In January 2020, Ji Hyun-woo releases the first mini album of the band 사거리 그오빠(SGO).

[49] In 2022, Ji will release the single "Shake it Boom", which is a song by his band Sageori Geu Oppa (SGO).

[50] At the press conference for the last episode of Queen and I on 7 June 2012, Ji made the surprise public declaration: "I wanted to make this confession in front of the fans who enjoyed our drama.