K-POP STAR KANG DANIEL(SPORTSDONGA DB) “IT HURTS BECAUSE YOU ARE YOUNG”. It is a very famous sentence in Korea. The first time this word was said was in 2011. It's been over 10 years. "IT HURTS BECAUSE YOU ARE YOUNG" is also the title of a book written by Professor Kim Nan-do of Seoul National University. This book comforts and encourages young people who are tired of the unpredictable future and hard reality. However, there are also criticisms that they ignored the structural problems of Korean society and forced only constant efforts on young people. I also do not entirely agree with the phrase "IT HURTS BECAUSE YOU ARE YOU." You are a young man, so take it for granted to make mistakes. And try harder." The story is not new. Kang Daniel's(강다니엘) new song "UPSIDE DOWN" seems to be the 2022 version of Professor Kim Nan-do's "IT HURTS BECAUSE YOU ARE YOUNG." Kang Daniel's 'UPSIDE DOWN' is the title track of his first