From the DVD The world outside the cage. Hizumi learned the most important word in English. This part is towards the end of the dvd where Hizumi crashes the 봉고차, 반 and the lady tells him to say sorry.
This song has a good meaning. It's about never giving up and living your life to the fullest. Make your life have a good meaning because 당신 are the only one who can do that.