He later became an associate member of the company's pre-debut training team SM Rookies, with the stage name "Yongju",[note 1] although he did not get officially introduced.
His only documented activity with the pre-debut team was a performance in "SM Town Week" in 2013 alongside the now-NCT members.
In the final round of the second season, he became the first winner of the show and also won a debut quota as a member of a new boy group.
In January 2018, they released "Ferdy's Project vol.2", with the single "At That Place", and Park again took part in singing and composing the track.
Park is signed to MostWorks Entertainment as a solo artist and debuted on 22 May 2018 under the stage name Yongzoo (용주).