Because there are a lot of modern words, behaviors and actions in Sweetheart Gege, if the story is set in the Qing Dynasty, it is easy to expose its hands and feet, because there are many minefields, and it is easy to be questioned and vilify historical figures.
Therefore, from the third season, the production team planned to adapt "Sweetheart Gege" into a modern play, so the story stage shifted from the Qing Dynasty to the modern society.
Let's take a look at the specific development of modern drama first. Personally, I think there are two reasons.
First, the words of modern drama will conform to the present life and arouse people's resonance. Now online jokes emerge one after another. If in the Qing Dynasty, these jokes and hilarious stalks can't be better integrated into cartoons, it will make people feel that they are jumping in the drama, the times are unclear, and they will misunderstand children, leading to misunderstanding of history and uglification of historical stories.
Second: ancient times were very particular about etiquette. Even the open Tang Dynasty had rules to follow. It is impossible to say that ancient openness and modern openness are the same thing. Not to mention those men and women, it is impossible for casual leading groups in costume dramas to play together casually. In ancient times, men and women were three years old, and they were separated when studying. They would never go to school in the same study, not to mention that the leading group in the story often went to the room. If they do this, they will lose their reputation and life, so they will be changed to modern drama. The friendship between men and women will be more open and recognized, and in modern times, both boys and girls are compulsory and need to go to school, so it is more in line with the design and behavior of the leading group to change it into a modern drama.
Therefore, the third season of "Sweetheart Gege" was changed into a modern drama, in order to conform to the current thinking and aesthetics.