Here is a concise summary of the provided transcript:
**Context:** A challenge or game show with contestants (including Seokjin, Kwang Soo, and Kim Jong-kook) in a scenario where:
* **Initial Setup:** A mysterious situation with "unidentified germs" spreading in Seoul, and a character known as "Persimmon Vinegar Man" is mentioned.
* **Challenge:** Contestants must complete a mission (initially, buying items from a convenience store) without laughing or smiling, as this can lead to "infection."
* **Key Events:**
+ Seokjin is initially sent on the mission.
+ Later, Kwang Soo and Kim Jong-kook attempt the challenge, facing various distractions (fans, photo requests, etc.) designed to make them laugh.
+ Kwang Soo fails to complete the challenge due to laughing, while Kim Jong-kook succeeds.
**Tone:** The transcript suggests a lighthearted, comedic tone, with an emphasis on the challenges of maintaining a straight face in absurd situations.
Here are the extracted key facts in short sentences, numbered for reference:
**Note:** Since the text appears to be a transcript of a TV show or video with a challenge/mission, some facts might be context-dependent. I've tried to extract the most objective facts possible.
1. Unidentified germs are spreading rapidly around Seoul. (**Location & Situation**)
2. A person named Seokjin is chosen to complete a mission. (**Character Selection**)
3. The mission involves buying items from a convenience store. (**Mission Objective**)
4. Smiling or laughing while completing the mission may lead to "infection". (**Mission Rule**)
5. A character is asked to give autographs and take pictures with fans. (**Secondary Interaction**)
6. Fish-shaped buns with choux cream and red beans are offered to participants. (**Environmental Detail**)
7. Kwang Soo and Jong Kook are also part of the challenge at some point. (**Additional Characters**)
8. A "mission fee" is mentioned, implying a reward or penalty system. (**Game Mechanic**)
9. A cash receipt is shown, indicating a transaction. (**Transaction Evidence**)
10. An item costs 7,777 won. (**Specific Cost**)
11. Lee Kwang-soo failed the challenge, but Kim Jong-kook succeeded. (**Challenge Outcome**)