Together Forever(Chaekook ff)(JJK X SCY)

Son Chaeyoung is the step sister of Kim Taehyung... They treated her well and was a small happy family.... But then when Chaeyoung was 10 she was diagnosed with heart problems.... And it was told that she would not live for more than 10 years..... 8 years later, Jeon Jungkook enters the Seoul University... He was s...