Crush released a single titled “Red Dress” featuring TakeOne on December 7, 2012. In the following year, he released two singles, “Crush On You” and “어디 갈래 (Where Do You Wanna Go)” which featured Taewan and Gary.
He officially debuted on April 1, 2014 with a single titled “가끔 (Sometimes)”. His first album, Crush on you, was released on June 5, 2014. He also collaborated with Gaeko for the single “Hug Me”. In August, he sang “잠 못드는 밤 (Sleepless Night)” for the OST of the SBS television drama It’s Okay, That’s Love. He then released the song “Sofa” in October.
In 2015, he collaborated with Zion.T for the single “그냥 (Just)”. The song was released on January 30, 2015, and debuted at number one on the Gaon Singles Chart. They also won Best Collaboration & Unit at the 17th Mnet Asian Music Awards. In July, he released the single “Oasis” which featured Block B’s Zico. He also held his first solo concert, Crush On You, from November 13 to 14.
In January 2016, it was announced that Crush was to release a new single featuring Girls’ Generation’s Taeyeon. The song titled “Don’t Forget” was released on January 22 and won first place on Show Champion on January 27, marking his first music show win.
He is currently active as a member of the hip-hop crew ‘Fanxychild’, which consists of Zico (rapper, producer), Millic (DJ, producer), Staytuned (producer), Penomeco (rapper), and Dean (singer, producer). Their representative songs are “Fanxy Child “, “Bermuda Triangle”, and “Paradise”. “Bermuda Triangle” has topped several music charts.
In July 2018, he is set to release an EP titled Wonderlost.