Lets be honest I watched this movie just because of Jang Geun Seok. I was really surprised when Jang sang in this movie - he has really manly voice! Amazing! Don't get me wrong I liked his sweet, cute voice in You're beautiful or Mary stayed out all night - but in Happy life he is just soooo hot when he sings. For me one's of his best performance on stage. Ok I'm not supposed to write only about him :P This movie is about friendship that can be restored through passion to music. Music can bring back confidence, change your life and help you stand against whole world. Story was good, not amazing but decent enough to watch it till the end. I was truly impressed that all cast was musically talented all felt really honest. I enjoyed watching another role of Kim Sang Ho - he is such adorable Ahjeosshi :D I like his acting so much after watching City Hunter. All Jang fans - must watch!