Performing during the show in position 15, "Beautiful Mess" was announced among the top 10 entries of the second semi-final and therefore qualified to compete in the final on 13 May.

[1] The nation achieved their best result in the contest in 2016 with the song "If Love Was a Crime" performed by Poli Genova, which placed fourth.

[9] "Beautiful Mess" was written by members of the songwriting team Symphonix International: Borislav Milanov, Sebastian Arman, Joacim Bo Persson, Alex Omar and Alexander V.

Last November, I started working with Bobby (Borislav Milanov) with the idea to submit a song for Eurovision either for this year or next.

Besides this, my fans will see me in a different light than in my past projects, so I am really curious to find out what their reaction will be.Kristian Kostov made several appearances across Europe to specifically promote "Beautiful Mess" as the Bulgarian Eurovision entry.

[12][13] On 8 April, Kostov performed during the Eurovision in Concert event which was held at the Melkweg venue in Amsterdam, Netherlands and hosted by Cornald Maas and Selma Björnsdóttir.

[15] According to Eurovision rules, all nations with the exceptions of the host country and the "Big Five" (France, Germany, Italy, Spain and the United Kingdom) are required to qualify from one of two semi-finals in order to compete for the final; the top ten countries from each semi-final progress to the final.

[16] On 31 January 2017, a special allocation draw was held which placed each country into one of the two semi-finals, as well as which half of the show they would perform in.

The stage colours were black and blue and the LED screens displayed white dynamic lines and shapes that transitioned to a torrential rainstorm effect as the song progressed.

[24] Three off-stage backing vocalists joined Kristian Kostov: Borislav Borisov Dimitrov, Cesár Sampson and Vlado Mihailov.

Each nation's jury consisted of five music industry professionals who are citizens of the country they represent, with their names published before the contest to ensure transparency.

This jury judged each entry based on: vocal capacity; the stage performance; the song's composition and originality; and the overall impression by the act.

In addition, no member of a national jury was permitted to be related in any way to any of the competing acts in such a way that they cannot vote impartially and independently.

The individual rankings of each jury member as well as the nation's televoting results were released shortly after the grand final.