Thanks for the link, exadel. I really feel that the lyrics are meaningful and that 5566 is sincerely appreciative of the fans that support them. I think that it has resonance, especially with all the recent rumours about 5566 being not popular, one of their shows being cancelled, etc.
Here is my attempt at the translated lyrics (using Google for help):
Behind My Back...
Giving, but not asking anything in return, you still love me
When others belittle me, you defend me, then turn around and hide your tears
Some love will change with reality
But your love for me always makes you place yourself last-
Like wings behind my back which can lift a heavy weight
Like the sun behind my back which makes me not fear the cold and loneliness
You know that I never stopped trying hard
You are the one there- You are the one behind me
You live in my heart
When there is hatred and harsh whispering
You are the only happiness I have
There are rumours every day, but in the end, nothing has really changed
(There is some love) which is dear, but does not make one give up freedom
(Your love) will make me turn around and my eyes fill with tears
Like wings behind my back which can lift a heavy weight
Like the sun behind my back which makes me not fear the cold and loneliness
You know that I never stopped trying hard
You are the one there- You are the one behind me
You live in my heart
I want to travel around the world, holding you in front of me,
I don't want you just to be behind my back, neglected
A step at a time, together, we will see the most scenic places
This would be the most memorable of all things to me (You are my everything)
Like wings behind my back which can lift a heavy weight
Like the sun behind my back which makes me not fear the cold and loneliness
You know that I never stopped trying hard
You are the one there- You are the one behind me
You live in my heart
You are there, behind me
But you have always been in my heart
You are there, behind me,
You will always live in my heart