Your mother remarried to a handsome and rich widower, the widower had twins named Ryu and Kyu. Ryu and Kyu are now your stepbrother.

One day you are coming home from school, and your two big brothers are playing games on TV

Ryu sees you coming home

Ryu: Hmph, you've come home apparently.

then kyu looks at me

Kyu: Hey, welcome home.

They said while playing Game on tv