Park Hae Gon, later legally changed to Park Si Young, is a South Korean singer, dancer, former member of MIRAE (미래소년), and current member of KO1KEYZ (コイキーズ/ 코이키즈) under Lapone Entertainment (LAPONE 엔터테인먼트). He attended Anyang High School but dropped out, and he later passed the High School Graduation Qualification Examination.

He was a trainee at DSP Media (DSP미디어) since 2018 and entered the survival show "Under Nineteen", finishing among the Top-20. He could have debuted with the show's project group 1THE9, but decided not to. He returned to DSP activities, where he briefly appeared in APRIL‘s Japan debut single “Tinker Bell” MV.

He made his debut in March 2021 as MIRAE's main dancer, sub-rapper and sub-vocalist with their 1st EP "Killa". They enjoyed some success, but their agency faced criticism for not promoting the group more effectively. They debuted in Japan in February 2024 with their mini-album, "Running Up", but, unfortunately, DSP Media announced the group's disbandment in July 2024.

In January 2026, he entered the Lemino singing survival show "Produce 101 Japan: Shinsekai", where he placed 3rd in the finale, earning him a spot in the resulting project group. In August 2026, they pre-released the song "KO1KEYZ". They made their debut in Japan and South Korea simultaneously on October 7th, 2026.

(Source: MyDramaList) Edit Biography