They understand and mingle with each other, but do not intersect.
They pity each other and know each other, but they ignore...
Like everyone who passes by in the city, they have never stopped for each other, nor will they stop for others. Forget each other, miss each other...
He will not remember her and she will forget him.
He and she are just shadows passing by in each other's world, coming in a hurry and leaving in a hurry.
Ultimately, no trace is left behind.
And here, they just tell their similar but dissimilar stories