Yunho and Sooyoung was once a couple .. But thing didnt make out . 

Sooyoung actually went to a far far far away land ... She had decided to gave her life away .. For that one and only person she loves , which was Yunho .. 

Yunho thought that she was cheating on him because she was always close to Siwon and Kyuhyun ..

1 week before their wedding ,

They had a really big fight which ended up bad ....

Yunho was admitted into the hospital , he had suffered loss of blood  , he needed a blood transfer soon ,

Everyone who was close to him wanted to gave him a blood transer , but sooyoung wanted it instead , she pleaded and pleaded .

She had a special blood , a blood that no one can ever have .. She was special . She was the one and only kind in this world , she was Yunho's guardian angel .. But he took her for granted....