Lim Jaebeom was fine being an only child until one day his parents brought home a boy two years younger than him. He didn't like him and always told him to stay away from him at school. How will this brother-brother thing work out for them? *Markbeom is purely a brother thing only. They are not in a relationship.* Mark is 15. Jaebeom is 17. Started: 5/23/18 Finished: -/-/-