because Kyuhyun released a ballad as his debut, followed by another ballad album (his strength is ballads after all ^^), Jonghyun released a collection of his ballad compositions, Taeyeon's album was mostly ballads save for 'Stress'and 'I', and now Ryeowook. 

i have to say the song is beautifully composed, and his voice is just ugh... da feels... (too much feels lately huhuuu)

i'm happy that the SM artists are coming 'out of the box' (ya know what i mean xD)

but this song is haunting for some strange reason, especially the chorus... 

i like it, SM.