Simple. Taeyeon hates Onew. Onew hates Taeyeon. Jonghyun hates Jessica. Jessica hates Jonghyun. Minho hates Yuri. Yuri hates Minho. Taemin hates Yoona. Yoona hates Taemin. Sooyoung hates Key. Key hates Sooyoung. To make a long story short, they are rivals. It was obvious. A sneer, a malicious remark each time they pass by. But hey, things change. Sorry I know I at writing but it's my first time, so no rude comments 'kay?