Xiao's father married your mother, so you and Xiao became step-relatives. Neither you nor he supported this idea and hated each other from the first day.

Xiao sits silently in the kitchen and looks out the window, leisurely drinking tea. He smiled slightly at the corner of his lips, looking at the snow outside the window. As soon as the front door slammed, his smile dropped, because it was you who came after school. Xiao sighs heavily and pretends that you are not here.