[8][9] Hoya debuted as rapper, vocal and main dancer of South Korean boyband Infinite in 2010.

[13] In 2014, Hoya starred in SBS' music romance drama, My Lovely Girl; which co-stars his fellow Infinite member Kim Myung-soo.

[20] On August 30, it was confirmed that Hoya would not be renewing his contract (which expired June 9, 2017) and would be leaving Infinite as well as Woollim Entertainment.

[21] In September, he made his musical debut in Hourglass, a play based on the mega hit Korean drama Sandglass.

[25] In the midst of all, Lee also went to Immortal Song 2 that was broadcast on August 4 and eventually won the episode by getting the highest scores there.

On September 12, Lee also released a digital single titled, 'Baby U' featuring Kriesha Chu in the music video.

Hoya enlisted for military service on February 7, 2019, by announcing it through a post two days before the date; he was discharged on December 6, 2020.