Park Jae-chan (; born December 6, 2001), better known mononymously as Jaechan, is a South Korean singer, actor, and songwriter. He is a member of the K-pop boy group DKZ and was a member of its sub-unit Dongkiz I:Kan. As an actor, he is best known for his portrayal of Choo Sang-woo in the web novel-adapted drama series Semantic Error.
Park Jae-chan was born on December 6, 2001, in Daegu, South Korea. His interest in music began in middle school upon hearing Justin Bieber's songs. During high school, Jaechan received his GED and became a trainee.
In 2022, he entered the Department of Broadcasting and Entertainment at Global Cyber University together with his fellow members.
Jaechan officially debuted as a member of Dongkiz with the release of their single album, Dongkiz on the Block, on April 24, 2019. He is known as the rapper of Dongkiz. Jaechan also wrote and produce several songs for the group.
On July 7, 2020, Jaechan alongside fellow Dongkiz member Munik formed the sub-group Dongkiz I:Kan. The group debuted with the single album Y.O.U.
Jaechan's group rebranded from Dongkiz to DKZ on March 18, 2022. It was also during this time that his rise to fame courtesy of his BL drama, Semantic Error, had led the group to increase its album sales and popularity.
On September 6, 2023, Jaechan made his debut as a solo artist. He held a showcase at Yes24 Live Hall, where he presented his first solo mini album JC Factory. The EP consists of five self-composed songs including the lead single "Hello" and his earlier pre-released song "Time". He won his first music show award as a soloist in SBS M's The Show for "Hello" on September 19.
On May 16, 2025, Jaechan released his second mini album JC Factory Vol.2. The EP consists of five songs including the lead single "Poster Boy" and his solo version of their previously released sub-unit single "Y.O.U".
In 2019, Jaechan got his first main role in a Tooniverse web drama, My YouTube Diary, along with his co-member, Munik.
On January 12, 2022, South Korean streaming television series Watcha announced that Park Jae-chan would take the lead role in the live series adaptation of BL web novel Semantic Error. The popularity of the series led to a surge in support for DKZ. In April 2022, Jaechan was included in Forbes Korea's 2022 Korea Power Celebrity 40 - Rising Star for the attention he gained for his portrayal in Semantic Error.
Music credits adapted from the Korea Music Copyright Association's database, unless otherwise noted.