Giving a friend some good advice is very polite.
Yang asked Iris for some advice regarding a tricky puzzle.
Iris wants to decide to help Yang or not.
Iris decides to give Yang a hint on the puzzle to help him out.
Iris decides not to help him because it would make the puzzle less fun.
With her advice Yang figures out the next piece of the puzzle.
Yang remains stuck on the same tricky puzzle for a while.