Performing during the show in position 14, "Dark Side" was announced among the top 10 entries of the second semi-final and therefore qualified to compete in the final on 22 May.

In the final, Finland performed in position 16 and placed sixth out of the 26 participating countries, scoring 301 points.

In the 2019 contest, "Look Away" performed by Darude featuring Sebastian Rejman failed to qualify Finland to the final, placing seventeenth (last) in the semi-final.

[1] Finland's entries for the Eurovision Song Contest have been selected through national final competitions that have varied in format over the years.

Along with their participation confirmation, the broadcaster also announced that the Finnish entry for the 2021 contest would be selected through Uuden Musiikin Kilpailu 2021.

The show was broadcast on Yle TV1 with a second audio program providing commentary in Finnish by Mikko Silvennoinen, in Swedish by Eva Frantz and Johan Lindroos, in Russian by Levan Tvaltvadze and in English by Katri Norrlin and Jani Kareinen, as well as online at Yle Areena.

At least one of the writers and the lead singer(s) had to hold Finnish citizenship or live in Finland permanently in order for the entry to qualify to compete.

[6] In addition to the performances of the competing entries, the show was opened by Antti Tuisku and Erika Vikman, while the interval act featured Haloo Helsinki!

[7] 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.

[9] The two semi-finals and the final were televised in Finland on Yle TV1 with a second audio program providing commentary in Finnish by Mikko Silvennoinen, in Swedish by Eva Frantz and Johan Lindroos and in Russian by Levan Tvaltvadze.

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.

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