Tan Ping Koon is a Singaporean man who, together with Chua Ser Lien, was charged for the kidnapping of a seven-year-old girl for ransom during Christmas Day of 2003. Tan, who was the owner and manager of a transportation company, had several financial troubles and thus it led to both Tan and Chua to decide to kidnap a child of a wealthy businessman for ransom. The men also demanded a ransom of S$1 million before settling on the final sum of S$70,000 through negotiations. Two days after the crime, both Chua and Tan were arrested and brought to trial for kidnapping for ransom, and after they pleaded guilty to committing the crime, both men were each sentenced to life at Changi Prison and three strokes of the cane by High Court judge Tay Yong Kwang on 9 September 2004.

Chua Ser Lien was a Singaporean who, together with his accomplice Tan Ping Koon, kidnapped a seven-year-old girl during Christmas Day of 2003. The abduction was brief and witnessed by several people, one of whom gave chase to the pair. Both Chua and Tan, then aged 42 and 35 respectively, realised they were followed and released the girl at Tampines. However, the two kidnappers called the girl's father the following day and demanded S$1 million from him or they would hurt her family. The sum of S$70,000 was eventually agreed and paid to them before both their arrests on 27 December 2003.