The world may never know!
actually: yes, as long as you think they should. That's the beauty of a hanging ending :) As long as you think they should end up together, they will! Also season 4 episode 32 Yumi kisses Ulrich on the cheek and I'm quite sure they confess their love but it's in French and I only know what I've heard from the few french people I know...
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In the show "Code Lyoko," Ulrich and Yumi have a close relationship and their feelings for each other are hinted at, but their romantic relationship is never explicitly confirmed or developed further in the series.