The Fear of becoming adult, everybody felt that at some point of life. How it will be like to live alone? Will i have a good job? Will i find love? Those are questions that simply won't be answered before the time comes. As you grow older and you don't have the things you always wanted, you feel suffocated, like you're losing time, it will drive you insane!
Those feelings will make you feel like your life is ordinary, like everybody else have a better life than you.

With a great cinematography and soundtrack, plus a great acting of the male lead, the movie portrays greatly those feelings of Fear and Regret.