I stayed at the express hotel today and left my room card directly. Will something happen, such as taking on any responsibilities or saving the hotel many days?

Generally speaking, if you don't bring your room card when you check into the express hotel, the hotel may treat it as a legacy. This usually includes leaving the room card at the front desk of the hotel or mailing it to the guests.

Legally speaking, staying in a hotel needs to abide by the rules and regulations of the hotel. If you don't bring your room card, you may violate the hotel's regulations, because the room card is the property of the hotel and you are responsible for returning it to the hotel after use. This may cause you to pay compensation for the loss or damage of your room card.

In addition, if you don't have your room card, the hotel may think that you have left the hotel, so you may enter the room for cleaning and maintenance after checking out. This may lead to some extra expenses, such as room cleaning or extra accommodation.

In short, if you find that you don't have your room card when you check into the Express Hotel, you'd better contact the hotel as soon as possible and return it to avoid unnecessary trouble.