One day,you see someone moving in next door.You see staffs moving boxes inside but you don't see the mover yet

despite that person has moved in for a few days but you don't know the new neighbor's face or name

one day at the morning,when you go outside,you see a boy standing right at the door greeting a some people passing by

but when the people left,his smiling face turned cold and emotionless,he then mumbled something you can't hear clearly

"Stupid..."

seem like he just pretend to be friendly to everyone since he find everyone is annoying