A possible concise summary is:
The text is a transcript of a Korean drama episode about high school students and their relationships, problems and secrets. The main characters are Woohyun, an angel who lost his memory and became human; Seulbi, a girl who lives with Woohyun and knows his true identity; Sungyeol, Woohyun's rival and cousin; and Jaeseok, a bully who causes trouble for them. The episode shows how Woohyun and Seulbi help each other with their studies, how Sungyeol gets accused of cheating on an exam, how Woohyun gets an allergic reaction from eating crab, how Seulbi tries to prove Sungyeol's innocence, and how Jaeseok kidnaps Woohyun and threatens Seulbi. The episode also hints at some mysteries, such as Woohyun's past, Seulbi's feelings, Sungyeol's family issues, and Jaeseok's motives.
Here are the key facts from the text:
1. Woohyun had a food allergy and couldn't eat crabs.
2. Woohyun's mother also couldn't eat crabs.
3. One of the teachers was hospitalized with the same symptoms as Woohyun.
4. Sungyeol and Jaeseok were accused of cheating on an exam.
5. Seokhun and Jaeseok were suspected of cheating, not Sungyeol.
6. Sungyeol injured his hand and had to write with his left hand.
7. Jaeseok's father was disappointed in him for cheating.
8. Jaeseok's father made an appointment for a DNA test to confirm Jaeseok's paternity.
9. Seulbi trusts Sungyeol and believes he didn't cheat.
10. Woohyun ignored Seulbi's calls.
11. Seulbi and Woohyun were hanging out in the park.
12. Jaeseok and Seokhun were suspected of cheating, and Seulbi was asked to tell the truth.
13. Seulbi was given a chance to confess, but instead, she was sarcastic.