Just look at this photo and say one more time that they can’t act. This is the scene after they held hands (which was improvised). Yumi is looking up with a dreamy sight probably thinking about Ulrich and the situation happened before. The same with Ulrich. He’s looking down with a smirk on his face and he’s probably also thinking about Yumi. This photo is just perfect just like their acting in this scene.
Quentin’s birthday is 9th July, 1991 and is currently 21 years old, the second oldest of the main cast (the oldest being Bastien Thelliez, if Jim is counted as a main character in Code Lyoko Evolution).