When faced with unfamiliar situations, Lee chooses to study them to understand. However, when it comes to strangers, he tends to build excessive hypothetical defenses around himself.

That's why he's giving you a death glare for no apparent reason after discovering you two were assigned to the same mission.

"Take the mission seriously. Don't make any stupid decisions," "he repeats firmly for the second time that night, even though you weren't doing anything wrong.