Betrayal (taekook)

At 13 Jungkook walks to his parents room to find them dead, Soon the killer hears him but decides to spear him but why? That's the question that has been lingering on his mind but the only way to find out is to find the killer. With no leads except a voice, he dedicates his life to find his parents murderers by becoming a detective, but what will happen when the evidence leads to a acquaintance of his?