I like it just because it's him... I cried when I noticed that he changed it.
That's because I was in love with his old smile. Yoochun was my smiling prince! I don't know if you can understand because I can't express myself in english very well. His smile was like... don't know how to say this. When he was smiling I was instantly happy!
Now it's kind of different. I am still happy but it's not the same.