As bad first dates go, it’s hard to top the one had by Wang Pai and a woman known as Lili.

The two met online and hit it off enough to meet in person in their home town of Muling City, China, for hot sex.

Trouble was, it was only when they met in person did they realize that Wang, 57, was the father-in-law of Lili, 28, according to the Daily Star.

To make matters worse, Wang’s son, Wang Jai (or “Da Jun”), came home, saw the hook-up email on his wife’s computer and followed her to the hotel in hopes of ruining the rendezvous — not realizing he’d soon be running into his Dad.

The two had no idea of the other’s identity when they decided to meet. Wang Pai had used a photo of a fellow army buddy, while Lili had used a fake picture and the name “Ming Chen” during their chats.

Naturally both were shocked when they first laid eyes on each other, Pai admitted.

“When I opened the door, I don’t know if she was more surprised or me,” Pai said according to Orange News.

“She turned round and ran off down the hallway straight into her husband, my son, who had been following her. He started shouting and then he attacked her, and then he attacked me.”

Wang Pai allegedly told his cheating wife: “I’m out there working my ass off to earn money, half-dead with fatigue, and all the while you two are messing around,” the Daily Mail reported.

Wang Pai allegedly knocked out two of his wife’s teeth and gave his father a serious head injury that required him to be taken to the hospital. He was detained for five days by police, the Metro reported.

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