Recently, the Anti-Corruption and Bribery Prohibition Act has been ratified.
According to this Act, students should not present or give anything such as something to drink or eat or the gifts to their professors while making any request for special consideration. The thing is, however, that it can be also regarded as students request special consideration for themselves even if you are not intended to do so.
To prevent being falsely misunderstood, it is the best way not to give anything to professors including administrative staffs in this university. For this reason, even if you try to present something as an expression of your gratitude to professors or staffs, they cannot help but denying to get it.
So, please do not misunderstand that they are rude, and we are kindly request cooperation to Graduate School students not to violate this Act.