Jang released his debut single album Feel Good as a solo artist in August 2019.

In April 2017, Jang participated in Mnet's reality competition show to form a temporary boy group, Produce 101 Season 2, representing Oui Entertainment with two other trainees.

[7] After releasing some teaser photos, on August 24, Jang make his debut with the single album Feel Good which included two songs.

[8][9] On June 6, 2020, Oui Entertainment confirmed that they would debut their first boy group in the second half of the year and Jang would join the lineup.

[12] All song credits are adapted from the Korea Music Copyright Association's database, unless otherwise noted.