[4] Prior to their debut with Infinite, he and Hoya performed as a back-up dancer for various music promotion show Epik High’s Run.

The sub-unit has a different musical direction and style concept from Infinite, placing their focus on each member's rap and performances ability.

Dongwoo plays the role of main lead "Usnavi" along with Yang Dong-geun, Jung Won-young and Key.

[19] In October 2016, he released his first self-produced song with vocals featured by Yoon So-yoon, titled "Embedded in Mind".

[20] Dongwoo released his first solo EP Bye on March 4, 2019, which contains seven-tracks including the title track called "News".

[clarification needed][21][22] A showcase was held at Seoul's Ilji Art Hall in the same day of the EP release.