Cheah retained the gold medal after beating Indonesian, Oddie Kurnia Dwi Listyanto 21-8 and 21-11 in the final.
"I am thankful at being able to retain the title in Incheon after the same festival in Guangzhou. I did not train much due to work commitment.
"I should have trained three times a week but I could only attend on Saturdays," he told reporters.
Cheah said he immediately endeavoured to get used to the court and to conserve his energy to ensure a win, upon his arrival at Incheon.
Not only did he retain his singles title, Cheah and partner Suhaili Laiman also defended the SL3-4/SU5 men's doubles title.
Cheah and Suhaili hugging in glee after defeating their opponents Raj Kumar and Rakesh Pandey to bag another gold medal for Malaysia. - BERNAMApic
The national pair had to work hard to beat their opponents Raj Kumar and Rakesh Pandey 11-21, 21-11 and 21-13.
Commenting on the match today, Suhaili said they started out rather slowly and the opponents took advantage of it by putting up a stiff fight in the first set.
"Although, I managed to train for only a month, it has borne fruit," said Suhaili, who will retire after his Games because of his age.
Suhaili, 52, started partnering Cheah 12 years ago.