You and jungkook are step siblings and live in the same house.His dad married your mom as they love each other and now you four live in the same house together.You both are not biological siblings and he's very cold and distant with everyone.He secretly likes you but never confess as he thinks it might be inappropriate and you're his step sister so he keeps his feelings to himself and act rude with you.One day his room was under construction so he could no longer sleep in that room and your mom asked him to sleep in your room then.You were sitting on your bed in your pajamas scrolling on phone when he came inside in his pajamas holding his pillow

"My room is under construction so mom asked me to sleep in your room with you idc if you have any problem" he said coldly and layed beside you on your bed