Here's the scenario:
Jungkook is given a mission to get Jimin to say "thank you" when he receives a compliment (cause Jimin is known for never saying thank you - only saying things like 'stop lying, etc' when it comes to compliments)
When Jungkook reads the challenge he starts complaining about how this will be IMPOSSIBLE.
Jimin says thank you ON JUNGKOOK'S FIRST TRY.
The real gold of this video though is Kookie's reaction - he is TOTALLY shocked.