Performing during the show in position 5, "Lie to Me" was announced among the top 10 entries of the first semi-final and therefore qualified to compete in the final on 12 May.

In the final, Czech Republic performed in position 14 and placed sixth out of the 26 participating countries, scoring 281 points.

[5] ČT selected six entries for the national final from the submissions received, which were presented to the public during a press conference on 8 January 2018.

[9] The international jury panel consisted of:[10][11] Mikolas Josef made several appearances across Europe to specifically promote "Lie to Me" as the Czech Eurovision entry.

[15] On 14 April, Josef performed during the Eurovision in Concert event which was held at the AFAS Live venue in Amsterdam, Netherlands and hosted by Edsilia Rombley and Cornald Maas.

[16] On 21 April, Mikolas Josef performed during the ESPreParty event which was held at the Sala La Riviera venue in Madrid, Spain and hosted by Soraya Arnelas.

On 29 January 2018, 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 performance began with the dancers against light-up screens with pig on a small staircase against a predominantly blue and pink stage.

Despite having intended to doing a front flip off the staircase at the end of the song, Josef decided against the action due to a back injury that he suffered prior to the semi-final.

[23] At the end of the show, Czech Republic was announced as having finished in the top 10 and subsequently qualifying for the grand final.

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.