There's always a different feeling Yesung has.One thing he has but the other members don't have.

After Ahn Chil-Hyun,one of the most famous explorers in the world  has heard of The Sky Melodica he devoted his whole life to finding it.While he was about to leave Phuket a little Swallow started following him.When Ahn Chil-Hyun  noticed the small bird he thinking about the adventures he would have with the bird.So he happily accepted the swallow to accompany him through the wordwide adventure.