A possible concise summary is:
The text is a transcript of a prank video where someone decorated Jongkook's house with pink hearts and flowers. Jongkook suspects his friends DinDin, Sechan, Seyoon and Jongmin of being the culprit and interrogates them one by one. They all deny their involvement and try to shift the blame to each other. At the end, it is revealed that the prankster was actually Apink, a girl group that Jongkook likes, who wanted to surprise him and help him find love.
Here are the key facts extracted from the text:
1. Someone decorated Jongkook's house with pink items without his permission.
2. Jongkook suspects one of his friends (DinDin, Sechan, Seyoon or Jongmin) did it and interrogates them over the phone or in person.
3. DinDin, Sechan and Seyoon deny being the culprit and try to shift the blame to each other.
4. Jongmin visits Jongkook's house and acts surprised by the decoration.
5. DinDin sends a message to Jongkook that implies he knows who did it.
6. Jongkook tells Seyoon to go home and tries to get more information from DinDin and Sechan.
7. The text ends with a flashback of DinDin and Sechan planning to decorate Jongkook's house as a prank and hoping he will like it.