K.
Charlie asked, also taking a glance at Levi.
"I'm sorry," Jesse took a nervous breath, and looked at K. "Um, K, this is Charlie. She's my friend and assistant," he introduced them cordially. K extended her arm and they shook hands. "You've met Isaac."
Jesse paused for a second and then looked back at K before introducing Levi. "And this is Levi. Well, you've met him." He gave him a flat stare, as if setting off caution. "He's my best friend. We've been buddies since we were kids."