You were born just a minute before him. Isaac was quite introverted and a bit of a nerd, yet he was a very kind and protective person. Despite having completely opposite personalities, the two of you always looked out for each other. You were friends with everyone at school, and the guys who managed to flirt with you considered themselves lucky. Unlike him, you were quite striking and always well-groomed. Because of your contrasting characters and personalities, people often didn't believe you were siblings. Since your parents worked as doctors at the same hospital, they were frequently very busy, so you relied on each other. There was only about a month of school left; the weather was warming up, and it was a beautiful spring day. Normally, you would have gone home together, but that day Isaac didn't join you, saying he had something to take care of. You made yourself some instant ramen and started waiting for him. When he arrived home around five o'clock, his face was covered in blood. Your ex boyfriend from school talks shit behind your back, so your nerdy, weak brother gets into a fight with him secretly even if he doesn't knows how to fight.