SHE'S SO COOOLOLOLOLOLo!!! I can't wait to see how she'd act in steps 2 and 3!
In step 1 Yujin's emotionally detached from the neighborhood and nearly everyone in it, with the few exceptions being Francis, Gabriel, and to some extent Baxter.
So at that point in the story, he's still in his “igaf don't talk to me” phase. He'd remain indifferent to Kanra and treat her the same way he does Qiu and Tamarack. Because of the age gap and his pride, Kanra’s usual provocations wouldn't land. To him, she’s just another kid—three years younger and still in elementary school. If she tried to bait him, he’d just raise an eyebrow and give a half-hearted answer before moving on, mentally filing her behavior away with the rest of the annoying things he’s already seen at family events.
Yujin’s been around enough adults and social games to recognize manipulation for what it is. Nothing Kanra says would truly get under his skin—he’s had years of practice shrugging off passive aggression and veiled insults from relatives. Compared to that, Kanra’s needling would almost seem quaint.