I have changed since I become a university student because I have worked in part time job. When I'm working, I could learn something that I didn't know before. I didn't know that earning money is too hard. So, recently, I have saved money. For example, I have made plan about spending money. I'm satisfied with this change. 
I might enjoy my hobby life in 10 years. I love my hobby and money. I want to get both. So, I will work in a company,enjoying my hobby. Because my hobby is making music, if I could get off work, I can enjoy my hobby. I hope that I would not be doing only work
It's good that you are learning about the value of hard work, Dong Hyeok. Benjamin Franklin wrote a helpful essay on the value of time and money, 'Advice to a Young Tradesman'. I recommend reading it, if you have the time. You can find it here:
답글삭제http://www.complit.u-szeged.hu/images/franklin_-_advice.pdf
It is also good to enjoy your hobby (or hobbies). I remember that you told me you are interested in music. What instrument do you play? Are you in the picture in your post above? Maybe you can post a video of your band playing!