One lives downstairs
One moved upstairs
One is a college student
One is a school professor
In terms of age, he is 5 years older than him
In terms of appearance, he looks more mature
When did going upstairs become a habit?
When, the identity becomes confusing
What is hidden in his past?
Who will be his future?
Left, right, up and down
is age
It's status
It's identity
Or...
Stay tuned for "Who's on, who's off".