For me, it would be DBSK's RISING SUN Everytime i hear it, i like have this BOOST
to go one and just do my best ^^ i especially love the chorus 
"Break down the thick imprisoning walls.
Press forward with courage and strength
To regain my innocence.
I'll burn fiercely like a raging fire
And end like the radiant rays of sunset.
I'm waiting for the rising sun..."
