His employer, though very please with his work, has at times withheld pay, due to "payroll irregularities", demands many hours of unpaid overtime, and even going to the home of the owner to mow the grass. In a country that fines you heavily for importing chewing gum amongst other things, they offer little to no protection for guest workers. The contract with the employer is only enforced when it is in the favor of the Singapore citizen. Withholding of pay is not a crime against guest workers, and the guest worker can not leave the country until the contract is fulfilled on his/her part.
I'm posting this as a caution to anyone who wants to work abroad. Understand the law where you are going before entering into a contract. In many places, rule of law does not apply to anyone who is not a citizen and in some countries not the right religion.