I found out about Sehun watching Hyuna's clip and I thought "OMG, he really pay attention to Hyuna and watch her well." But still, we can't assume anything with this. It can be he just a cute fanboy. Hyuna has so many fanboy because she's very popular so I'm not surprise. Super Junior Heechul even said in one interview that male idols have Hyuna syndrome and they always rush to watch Hyuna whenever Hyuna perform / reherseal. Maybe Sehun is one of them. Hahaha...