Monthly renting fee
It is money for using the room. Generally, you need to pay the fee for the next month by the appointed day of the month.
It is common that you deposit the money of 1 to 3 months fee to the housing owner at the time of the contract.
It is set aside for repairs when the contract is terminated. Rest of the deposit will be paid back to you.
It is common that you pay key money of 1to 2 months fee to the housing owner at the time of moving.
However, some don't require key money.
It is introduction charge for the real estate agency.
It is stipulated by law that it should not be more than a monthly fee.
You need as much as 8 months fee at the time you move,
which is total of 6 months fee including deposit, key money, agency charge, and 2 months renting fee in advance.