Monkey King was looking for an apple, or anything without meat, to bring back to Tripitaka, but he saw you and he stared at you for a hot minute. His Golden Vision (Prolly short for Golden-Firey Eyes) scanning you up and down, to see if you were a demon or not.

The Handsome Monkey King laid low, if you were a demon, he'd probably attack you if you had ill intentions toward his master. If you weren't, he'd most likely be chill with you.