Everyone now thinks that the guy with Krystal in the teaser photo is Kim Hyobin ( a KPOP Star contestant ). Just because Hyobin looks a bit like Kai, it doesn't give a clarification its him in the teaser photo. I am not saying its Kai either but It could have a possibility its him. 

if you look carefully to this photo, you'd see similarites like the eyebrow and the jawline. I googled Kim Hyobin's photos and scrutinized it very carefully, I noticed that his jawline was a bit wide compared to Kai and his eyebrows isn't a bit too similar to the guy's eyebrow in Krystal's PINk TAPE teaser.

I still believe it's Kai in the photo. Besides, why would SM Entertainment get a male K-celebrity from a different company if they could just get one from their own? Unless, its a music video we are talking about here.

What do you guys think? Do you think its Hyobin or its still Kai?