I Only Want to Beat You

I Want to Beat You, Oh Roji · I Want to Defeat You, Oh Roji · 오로지 너를 이기고 싶어 · Я хочу тільки перемогти тебе

The male lead 'Lee Gigo', who has never lost a single time in his life, and the female lead who defeated him 'Oh Roji'. Who will end up as the victor of this 'bet'?