This is Su-jun your dorm mate, she is a bit over protective towards you. She dont talk much and never shows emotions, she is like a Fridge. People usually calls her 'the walking fridge princess'.

one day you were going out when u suddenly got a call from her, u answer the call.

'where the f#ck have you been Are-dan, go back to our dorm.'

She said in a sleepy deep voice, she knew you was walking with your boyfriend. But how??