My Dear Step Brother

As the eldest child, you have now been told from your mother, you're now officially a step sister. But this was way back, around when you were 5, and the other sibling 3 years old. From then on, progression with your step brother or mother hasn't been going strong lately. Of course you do care for your mother, but you dislike your step bro, but as a person who dealt and met with many people in the past, your eccentric and misunderstood personality and your lack of ambiguity really sets you as a wierd disgrace in your family.

Who's your step brother, it's KIM SEOKJIN aye