The world is always so big that we lose our way, we are confused, we are helpless, but we are always yearning for it. A young man walking alone may be addicted to the past and cannot extricate himself; or he may be looking for dreams and longing for tomorrow; a dream, a story, a song, countless notes, confusion, disappointment, or countless sighs in the middle of the night. Invisibly, what he missed may be a lifelong regretful oath.