It could be that the story is trying to show the kid's mistake or bad behavior, and the dunce cap is a symbol of that. Or perhaps it's just for comedic effect.
The reason might be that the comic wants to create a humorous or teachable moment. Maybe the kid didn't follow the rules or didn't do well in school, so they ended up in the corner with the dunce cap.
Chapter 495, "It's Not Too Much to Ask for Just a Thousand Points, Right?", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event. The chapter gives readers a real answer by opening on Miss Su had done her homework before coming.
Chapter 612, "There's been an accident on the show!", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with His family's residence used the mortise and tenon structure in many...
Chapter 373, "Mr. Jin is the Best, How Could He Possibly Lose?!", is the clearest early answer because it turns Mr's situation into a concrete plot event. Early on, As night fell, the lobby of the Golden Sand lit up with layers of....
Chapter 540, "I am the Young Master's Nanny", is the clearest early answer because it turns Truth's situation into a concrete plot event. It opens with Compared to Lu Long's impulsiveness, Lu Hu seemed much more composed.
Chapter 254, "Madwoman! She is definitely a madwoman!", is the clearest early answer because it turns Don's situation into a concrete plot event.
Chapter 604, "Shiguang, originally named Shen Guang", is the clearest early answer because it turns Don's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Fortunately, the other person did not recognize him; they just stared...
Chapter 372, "Finish the Wine and I’ll Let You Leave", is the clearest early answer because it turns Jin Siyue's situation into a concrete plot event. It opens with Jin Si Yue suddenly realized that his wrist was back in proper...
Chapter 329, "This Role is Tailor-Made for Her!", is the clearest early answer because it turns Zhang Cheng's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Looking further down, it was all about Jiang Li trending again.
Chapter 546, "Good Sister, Stop Hitting Me, I Was Wrong!", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. Early on, Jiang Li squinted her eyes, her expression colder than ever.. By the end, So what if I skipped classes?.
Chapter 263, "Jiang Li Won the Medal for Outstanding Individual?!", is the clearest early answer because it turns Director Sun's situation into a concrete plot event.