Final answer:
In this folktale excerpt, the character Gil-Dong outsmarts assassins, spares their lives, and secures a promise from them to never kill again.
Step-by-step explanation:
The passage describes a part of a folktale where the character Gil-Dong encounters assassins in the darkness of the night. Instead of finding their victim, the assassins wound each other and kill their guide. The room they invaded changes into high mountains surrounded by a storm. As they are about to surrender to their fear, Gil-Dong appears riding a donkey and playing a flute. He disarms the assassins and spares their lives on the condition that they never attempt to kill again, warning them that he would know if the promise was broken.