who wrote the songs' music and lyrics?

i must admit some of the songs from the korean series are great while others are just so-so...
how i hope i can play the tunes that i love to you, my friend.
then we can enjoy the song together.
but too bad...

if any of you have any website that can help me find out who is the composers for those songs,
do leave a comment or email me, ok?

祝愿您幸福! 必须幸福orh, 我的朋友! =)