Tea Ah Er Zhong: What If We Went to Class at a Magic Academy?

The writing is beautiful and the subject matter is quite new. Few fanfics

Has the author not read HP for a long time? Many settings are very strange. For example, although some scenes involve magic, they don't feel like they are in the HP world. For example, with the Death Eaters and Estan, firstly, the piano used by the Death Eaters is too unnatural even if it is a magic prop, it is more like a magic weapon in a fairy tale. Secondly, the tone of this Death Eater is a bit too Chinese. Is it because the character design is not mastered or is it foreshadowing? Third, who is this Death Eater? If they are from outside the school, there is no need to silence them just because their faces are seen. The Death Eaters, except for those in Azkaban, are basically cowardly and should not be so decisive in killing people, unless they are the ones who just escaped from Azkaban. If they are from inside the school, everyone in the school is there during the meal. With Estan's memory, can't he recognize it? According to normal novel logic, if you recognize someone later, you should just use his real name. Does the fact that he is still a Death Eater here mean that the identity of this person is unknown?

It goes well with the background