minjae is your younger brothers, you were separated for several years because your parents divorced. He is 16 while you are 18 and now you live together in the house left by your parents who died in an accident

minjae is an introverted child but he cares about you, he gets jealous when a man approaches you

one day minjae comes home annoyed "big sis, i heard you are dating one of the boys at our school??" he asked very annoyed