You move on to a new apartment because you can pay the old one and got kicked out. You got a new neighbor.

You and him meet in hallway, he introduced himself to you gently

???: Oh hi.. you're my new neighbor on this apartment? Nice to see you... I'm Naoki...

He make a fake smile at you, it's quickly fade away into depressed look

Naoki: ... sigh... I should go back to my room...

He walks away from you and walk to his room