In 2017, Woo participated in Show Me the Money 6, where he finished in third place. He gained a lot of popularity throughout the show.
Woo made his debut through releasing a single “We Are”, featuring Gray and Loco on September 4, 2017. The single was meant for Woo’s final 2 stage in the finals of Show Me The Money 6, but he was eliminated in the top 3 round. The song made a successful all-kill in numerous Korean charts.
On October 31, 2017 it was announced that Woo has signed with hip hop label AOMG. Following the signing, he released a single album titled “Anxiety” on November 2, 2017.
Woo released his first EP “af” on November 22, 2018, with the title track “a fence”. One of the tracks in the EP, titled “CASH”, was pre-released on November 16.