Hehehehehehehehehehehehe, the landlord worries too much. The bank can't ask you to brush the credit line. If the credit line in the card is gone, it will prompt that the credit line is insufficient, so as long as your credit card can be swiped, it means that there is still a credit line left in the card for your consumption.
The billing date of your credit card is the 25th of each month (usually in the evening), that is, the accounting details from June 26th to June 26th to June 25th will be settled in the first bill. The final repayment date is 20 days after the bill date, that is, the bill amount settled on February 25th of 1 year, and the repayment must be made before June 4th of 1 year at the latest. As long as you pay in full every month according to the bill on the 25th, your consumption is interest-free (you must know that you can't withdraw cash) before the final repayment date, and you won't be charged any extra fees, so don't worry.
The credit line in the card is 30,000 yuan. You can recover as much as you spend, reduce it immediately after swiping the card, and recover the deposit immediately after receiving the account. Your overdraft limit can't exceed the approved limit of credit card, which you really don't have to think about.