I got this news from a friend and I think I should share it to warn fellow bros here.
Not a vivid poster so I will be short and sharp:
My friends were at the family ktv (Star Party) with a few regular MMs. A few GongAn came in after about half an hour with no warning. The attitude was quite aggressive surprisingly. They ordered the MMs out and demanded IDs from my friends. Despite showing them their Singapore passports, they actually confiscated them and told my friends to sit and wait for the police cars as they will be arrested.
They ignored protests and threats of contacting the embassy and started taking out the plastic handcuffs. After cuffing my friends, they left the room and about 5 mins later, some guy who worked for the ktv came in and told my friends that the GongAn can let them go for 10000 rmb. In the end, they bargained till 5000 rmb and was let off.
My friends left the ktv and later their MMs told them they were also told to pay 500rmb to be let off.
Now they suspect this family ktv is a black shop and will alert the GongAn if foreigners come in with MMs and exhort money from them.
So bros be careful and avoid this ktv, now they have exhortion...