Can I stay in a seven-day hotel without an ID card?

Yes, just provide one party's ID card. All budget hotels only require this. Nobody cares about your relationship. After all, people have to make money.

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Not strict, just a chain. As I said, the purpose of others is to make money, not to pry into your privacy.

I have stayed in many hotels such as 7 days, Junting, Hanting and Motel, and all I need is an ID card.