Jung Jae-won (정제원), also known as ONE, is a South Korean singer, rapper, and actor.
He first debuted with Kim Samuel as the duo 1Punch in 2015 under Brave Entertainment before debuting as a solo artist in YG Entertainment.
Aside from singing, One has also acted in the dramas A Korean Odyssey (2017), Room No. 9 (2018), and Her Private Life (2019). One also acted as the main lead in his debut film "Goodbye Summer" in 2019.
Following the end of his contract with YG Entertainment on July 17, 2019, he's now under his own management company, Private Only.