In the evening, he'd take them to a KTV, a karaoke entertainment establishment often synonymous with sexual services.
There, a "mamasan" -- a name given to a woman in charge of running businesses at brothels -- would line up a dozen young women, mainly Chinese but also Japanese, Korean and -- the most expensive of all -- Russians.
"You choose one or two, sing and drink and have a bit of fun, and then go to a room upstairs for some 'business.' Not love, only business," said Han, who used a pseudonym as prostitution is illegal in China.
Today, doing that type of business is becoming increasingly difficult.
In February 2014, the government launched a crackdown on the sex trade in Dongguan
, which has been dubbed China's "Sin City."
More than 2,000 hotels, saunas and massage parlors that catered to the city's migrant workers and visiting buyers were shut down
, according to state media.
Thousands of people were arrested
, including suspected operators and organizers of prostitution, alongside high-ranking officials and corrupt police officers.
The city's vice mayor, who was also head of the city's public security bureau, Yan Xiaokang, was removed from his posts.
The raids lasted several months and their impact is still being felt more than a year later.
Empty red light districts
Indeed, at my hotel, a four-star establishment in the heart of Houjie, one of the red light districts, the massage and sauna floor still remain closed.
So are spas and KTV facilities at other hotels in the area that I visited.
On the streets, not one single "xiaojie" -- the Chinese word for miss that's also slang for prostitute -- is to be seen. In barbershops, often a front for sex services, staff seem to actually focus on customers' hair and nothing else.
Lin Jiang, a professor of public finance and taxation at Sun Yat-Sen University in Guangzhou, estimated that the raids could wipe out out 50 billion yuan ($8 billion) for businesses, including hotels, shops and restaurants. That's a tenth of Dongguan's city revenue in 2014.
He says it's impossible to know exactly what the financial losses were because officials have been too secretive.
"We can only estimate, we can't get the data to prove it."
Lin says the crackdown has caused financial pain in more ways than one. Dongguan's economy has traditionally relied on low-cost manufacturing. Efforts at growing high-end service industries and advanced manufacturing have been hampered by the high profile prostitution crackdown.
"The anti-vice campaign has hurt the city's image and this shadow won't completely disappear," he told
Han, the businessman, agrees.
"We absolutely have fewer customers coming to Dongguan now than a year ago."
But even if the go-go days of Dongguan's red light district are over, it doesn't mean the sex industry has disappeared. Rather, the trade has gone underground.
Han can no longer openly take customers to KTVs or saunas for the "Dongguan standard," but there are ways of flying under the radar, he said, like having your own contacts with go-betweens and "mamasans."
Getting contacts was far from difficult, as I experienced myself.
Coming back to my hotel one night, I was approached by the lobby boy. "You like massage?" he asked with a cheeky smile.
For 1,000 yuan ($160) I was offered 90 minutes in my room with "two beautiful Chinese girls." He gave me his number.
Right before the lift doors closed, he winked at me and made a risqué hand gesture suggesting a type of sexual service.
A hotel chauffeur also offered his services. As we were driving along a busy highway, he turned back to me and said "anmo, anmo?" -- massage in Chi