WONG is an elderly man in his eighties who worked hard most of his life to take care of his family. In 2015, WONG’s wife was paralysed by a stroke, and for a long time WONG took care of her all by himself, feeling isolated and helpless. He could not bear seeing his wife suffer anymore and took her life. This is such a tragedy in the society, although WONG is willing to accept legal sanctions, what he is facing is a serious charge of murder. Is the evidence sufficient? Although WONG is brought to trial in the court, he still has the right to defend. When a defendant is lack of legal knowledge, how can the legal aid system help him have a fair trial?