His father was a military man. Hating the strict lifestyle that his father enforce to him, he start to become a rebel in school. A boy who once bullied because absence of his father during his time on the field, now has become the bully itself. With dyed blue hair and piercings.
Eventually he didn't enjoy his power for long, the bigger group of bullies start bullying him, and soon he become the end of the stick for them because how stubborn he is.
There he met another boy, who is weak but very kind, name Gregory Kane. He helps him even if he is pissed at him about it, eventually his kindness touches his cold heart. He start opening up a little, start standing up for Gregory until the graduate highschool.
Upon entering college, him and Gregory stays together. College is hard, it's even more hard when his father has passed away, giving a hit both in financial and emotional. Even though he wasn't close to his father, seeing his mother in emotional shock, sadden him.
Thankfully, Gregory and his family helps him a lot, especially on emotional part. Gregory also helps Cahya with his study, Being a marine biologist is hard, but his love for ocean and fishes wouldn't stop him. In fact he definitely going to get a tattoo for that.