The age between 18 and 22 was the brightest time in An Lan's life, so much so that she often looked back and missed it. 4 Years is short, but memories are long. When recalling the past, she will always inadvertently discover some details that she has never noticed before. An Lan wants to let words remember her crazy and bright youth time before she forgets it. It is these warm and splendid pasts that always remind her that she was once so loved.