Su Yu smiled as he looked at Tang Lele who finally managed to complete a sentence as he expresses his thoughts. This is a good step for Tang Lele. Even if Su Yu knows that Zhang Hanyu should have trained Tang Lele on how to build his (TLL) confidence, but it seems that Tang Lele's progress is slow when it comes to expressing his thoughts since Tang Lele, as he looked right now, Tang Lele is awkward and is having a hard time to word his thoughts.
So, if possible, Su Yu wanted to help Tang Lele express his thoughts. After all, this could let you speak out your thoughts… that is, you could have a voice in someplace. At least, someone would be able to listen to you.