A Sydney man who once taught taekwondo has been ordered to spend the remainder of his life in prison after admitting he murdered a young student and the child’s parents in a case that gripped Australia. The judge ruled the crimes were so severe and senseless that there was no place in society for the former instructor, ensuring he will never be eligible for parole.
Jealousy and Financial Pressure Behind Tragic Killings
In a ruling delivered Tuesday by a New South Wales Supreme Court justice, 51-year-old Kwang Kyung Yoo was sentenced to life imprisonment without the possibility of release for the deaths of a 7-year-old boy and his parents. The judge stated Yoo’s motive was largely driven by intense envy and frustration over the family’s perceived success.
At the time of the murders in February last year, Yoo was struggling financially. He was behind on rent for his taekwondo academy and owed significant debts, factors that the court heard contributed to his unstable state of mind.
Sequence of Events: From Studio to Family Home
The court was told that Yoo lured the boy and his mother to his Lion’s Taekwondo and Martial Arts Academy in western Sydney, where he strangled both victims. He then took the mother’s luxury BMW and used it to drive to the family’s residence in Baulkham Hills. There, he stabbed the 39-year-old father to death. Signs suggested the crimes were at least partly premeditated, as Yoo had reportedly kept the family under surveillance beforehand.
After the killings, Yoo sought medical treatment, falsely claiming he had been assaulted, which led to his arrest. Despite expressing remorse and spiritual repentance later in court filings, the judge concluded that such statements could not outweigh the extreme violence of his actions.
Court Verdict: No Chance of Release
Justice Ian Harrison emphasized that Yoo’s level of culpability and the need to protect the public required the harshest possible punishment. Under state law, children involved in crimes are not named publicly, so the young victim and his parents remain unnamed in official records. All parties involved were originally from South Korea but resided in Australia at the time of the murders.
The sentence marks a definitive end to a shocking chapter for the Sydney community, highlighting how unchecked personal grievances and psychological distress can result in heinous violence.





















