"Weilou" is the fortress of the hometown, and "Nanyang" is the wandering in the distance. "There is a letter" is the light in the three words, the tenderness that continues through war, separation, and time. This is not a tragedy about separation, but an epic about "how not to be separated". It is most suitable for unfolding thousands of words of fireworks in the world and deep feelings of mountains and seas in a slow-paced narrative.