Park Gun Wook (박건욱; or simply Gunwook) born on January 10th 2005, is a South Korean singer, rapper and lyricist under Jellyfish Entertainment & WakeOne Entertainment. He is a member of the boy group ZEROBASEONE.

He is best known for being a contestant on the reality survival shows Wild Idol and Boys Planet.

On August 10, 2021, Park Gun Wook was introduced as the 16th contestant of the survival show Wild Idol. Unfortunately, he was eliminated in the final episode, thus making him unable to become a member of TAN.

On December 29, 2022, he was introduced as a contestant of Mnet's survival show Boys Planet, representing Jellyfish Entertainment. During the show's finale, he was revealed to have ranked 5th overall, thus making him a member of ZEROBASEONE.

The group debuted on July 10, 2023 with the mini album Youth in the Shade.