Lemarchal released his debut single, "Écris l'histoire", in March 2005; it peaked at number 2 in the French Singles Chart and was only held off the number 1 spot by Ilona Mitrecey's "Un Monde parfait". The single spent a total of 21 weeks in the chart and went platinum. Soon afterward, he released his highly anticipated first album, Je deviens moi, which debuted at number 1 and was certified platinum. The second single from the album was "Je suis en vie". It debuted at number 17 in the French Singles Chart, dropping to number 26 in its second week before climbing back to position number 21. The song remained in the charts for a total of 13 weeks. A third single, "À corps perdu", was less successful, with major French radio stations refusing to play it on account that it was "too sad".