Look this is how Yoona's relationship with Siwon went... Yonna and Siwon Has been dating two year now,and they love each other... But then his ex,(who is Sunny) comes into their relationships... (at school)"They said theres going to be a new girl, i wonder who it would be?" Eunhyuk said... "I know right, i hope shes hott.."Donghae said and smiled at Yoona. "what?" Yoona asked questionably. Siwon Took Yoona's hand and held it tight... "No ones as beautifull as MY YOONA.." Siwon said and hugged Yoona. She blushed.. "Aish..." The two friends sighed,"We know Siwon nobody can be compare to Yoona.."Donghae said... And they all laughed...