Why is he smiling

I guess everyone knoes I have this huge obsession over this guy call Jun Rui. I guess I'm still giving false hopes to myself that he likes me after this incident. I t all happens like this...

En Yu, my classmate, posted this video on Instagram. Jun Rui was holding on to the holiday homework. I guess En yu lost her holiday homework. -_- She had a meet-up with Jun Rui at the bus stop, like just the both of them. En Yu was saying enthusiastically to Jun Rui " Say hi to Rui  Ling!!". Jun Rui replies with a smile and walk way.

Hey guy!!! Can I ask you a question??? what does his smile represents sia. It's not the first time he laughs or smiles when my friends say my name. Like seriously, why are you smiling???
 I hope someone can answer that question)

I really hope I can get the exact answer from Google. Sadly, our technologies are not that advance. Hopefully, one day, I can ask Google whether Jun Rui likes me