When driver Fan Jianfeng found out that his wife was having an affair with her colleague, he demanded to meet the third party in October.
The Chinese national wanted to take a pair of scissors and a screwdriver to the pow wow, but his wife, Ms Luo Shudan, stopped him.
But the 34-year-old managed to buy a pair of scissors from a 7-Eleven store en route to the meeting, without his wife's knowledge.
When the lover, Mr Liu Wei, turned up, Fan attacked immediately with the weapon, before the victim could speak. He stabbed him repeatedly and stopped only when the 24-year-old victim collapsed, bleeding.
Fan admitted to causing hurt at the void deck of a housing block in Jurong West and was sentenced to one year in jail and given three strokes of the cane yesterday.
In mitigation, Fan, who comes from a broken family, said he realised his mistake. He told the court his wife, who is 27, became his only dependant when his mother died shortly before he got married.
He said he could not accept that the victim, who works in the same factory as Ms Luo, had snatched his wife away and destroyed his family.
"After I found out, I was badly affected. It was a bad dream for me. So now, my family and future are gone," he said through an interpreter.
He said he missed his son whom he had not seen for one year and hoped to get a light sentence so that he could be re-united with his child as soon as possible.
Mr Liu was hospitalised for three days for several cuts, mostly on his back. He was given about a month's medical leave.
District Judge Christopher Goh said the victim's injuries were severe, and that Fan had stabbed the victim several times.
Fan could have been jailed for up to seven years, fined, caned or received any combination of the punishments.