DC vs Youngjae (Youngjae’s good balancing skills)
HD vs Himchan (poor himchan. HAHAHAH)
HD vs Youngjae (I can’t even. HAHAHAHA)
About Sehun knowing, I think he's known something for months. Back in their second weekly idol appearance last summer when Baek was ranking the members, Sehun was like "Chanyeol is over there!" near the beginning when he was still choosing the top 5 as if Sehun was surprised that Baek hasn't picked Yeol yet (and if it wasn't for teasing Chen& revenge on D.O. for his round) I think he would have picked Chanyeol to be last just to tease him for staring at him like OuO to pick him (there's a gif).