Unhappy with the way the management had dealt with two incidents in the course of his work, a Marina Bay Sands casino dealer decided to take revenge by misappropriating casino chips worth $118,000.

Jiang Kaiwen, 24, a Singaporean, pocketed the casino cash chips entrusted to him between March 1 and May 3. He passed the misappropriated chips to two friends, Li Zhifan, 24, and Dong Hao, 23, both students from China, to cash out as employees were not allowed to cash out chips.

Yesterday, Jiang was jailed for eight months for criminal breach of trust, and another 12 weeks for 19 counts of colluding with Li and Dong to overpay them chips.

The scam involved Jiang overpaying chips to the duo when making winning payouts to them, making payouts even though they had lost their wagers and failing to collect their losing wagers.

Seventy other charges under the Casino Control Act were taken into consideration.

Deputy Public Prosecutor Thiam Jia Min said Jiang was unhappy with the way the management had dealt with two work-related incidents, and decided to take revenge.

On May 6, a review of closed circuit television footage by an MBS surveillance team of the gaming tables which had suffered losses revealed that Jiang had misappropriated casino chips from the floats of the gaming tables he dealt at.

When there were no patrons at the gaming tables, he would hide the chips in the bermudas he wore under his work trousers or in his shoes.

From April 7 to May 8, he stole from the floats 47 times. He was arrested at Changi Airport on May 9.

Dong is serving eight weeks' jail for his role while Li is claiming trial.

District Judge Kessler Soh said he hoped Jiang, who had testimonials from his friends, colleagues and national service commander, would learn from this.

Jiang was represented by Mr Ng Lip Chih.