KaiSoo is angst, so.....

Kai held onto Kyungsoo hand and cried. "No, hyung, no. Please!" 

It was Kai who got distracted. It was Kai who turned to look at Kyungsoo's smile for a moment too long. It was Kai who didn't see the truck approaching at great speed. 

Then why was his hyung lying there in a pool of blood instead of him? Why was his hyung's breaths getting shallower as the sirens grew louder? Why was his hyung paying a price for his mistake?