The same year he appeared alongside his sister Linda and brother Benjamin in a T-Mobile sponsored concert by Simply Red.

Two singles from Király Viktor, namely "Forgószél" and "Ha arra indulsz" were successes on MAHASZ and music television station VIVA.

An English language version of "Ha arra indulsz" retitled "Have I Told You" with an accompanying music video also gained fame.

The title track "Solo" topped the Hungarian charts, and the follow-up single "Crazy" was also a big hit in Hungary.

In 2013-2014, Király became a jury member and mentor in the talent program Az ének iskolája for young Hungarian singers between ages 8 and 16.

Király has participated three times in A Dal, the Hungarian national selection show for a bid to represent Hungary in the Eurovision Song Contest.

Reaching the finals, the song was selected in Top 4 by the four-member jury, but the public vote opted for András Kállay-Saunders to represent Hungary in Eurovision 2014.

Due to the success of Király's song, he re-recorded it in a new version featuring American musician Darryl McDaniels, also known as D.M.C.

In 2015, Király auditioned for season 9 of the American series of the reality talent show The Voice broadcast on NBC.

In the fourth episode of the "Blind Auditions" of the program broadcast on September 29, 2015, he sang "What's Going On" by Marvin Gaye with all four coaches, Adam Levine, Blake Shelton, Pharrell Williams, and Gwen Stefani, turning their chairs.