He performed the self-written "하루만 (I’m Nobody)" at the Pretty Man OST Japan Concert in July 2014.
He held a concert tour in China in November 2014 and performed in Beijing, Shenzhen, and Shanghai.
He hosted his own radio program titled MBC FM's Jung Joon-young's Simsimtapa (2014) and made his big screen debut in Love Forecast (2015).
After releasing, it achieved an "all-kill" on real-time charts and won the Mnet 20's Choice Hot Cover as well as 2013's Most Popular Karaoke Song of the Year at the 3rd Gaon Chart K-Pop Awards.
Even though he was at risk of dropping out several times, he passed through into the finals by Psy's choice in the judge's final decision.
He then released the self-produced 2nd mini album, Teenager, which contained six self-composed tracks on June 26, 2014.
Jung had his Taiwan fan meeting in 2013 and followed it with his first overseas showcase in Taipei in July 2014.
However, on the other hand, his persistence about rock music impressed a lot of viewers, and, as a result, it help him to establish a strong fandom.