He was convicted in 2015 of being involved in the City Harvest Church Criminal Breach of Trust Case, Singapore's biggest case in misuse of charitable funds. He was seen to be the "key man" behind the scandal who had guided his five accomplices by the Singapore court of three charges of criminal breach of trust. The judge also agreed with the defence that there was "a lack of any personal wrongful gain, any motive of self-interest or enrichment, and the absence of an intent to cause permanent loss" to the church. Although Kong and the five were guilty of serious breaches, the court noted that the $50 million was also ultimately returned to the church.