About criminal detention for being caught working in KTV

It's better to go to the police station and explain the situation clearly.

In the final analysis, it is suspected of allowing others to take drugs and harboring crimes.

As for what you are talking about, you are just a sweeper. Shouldn't be detained for 37 days.

Whoever allows others to take drugs or inject drugs, which constitutes a crime, shall be investigated for criminal responsibility in accordance with the law; if it does not constitute a crime, he shall be detained by the public security organs for not less than ten days but not more than fifteen days, and may A fine of not more than 3,000 yuan shall also be imposed; if the circumstances are relatively minor, the person shall be detained for not more than five days or fined not more than 500 yuan.

If it takes 37 days, criminal responsibility should be pursued. It won't be as simple as just a sweeper as you said.