Yeah, warlocks are probably one of the few things more powerful that vampires, even vamps with powers, so Jiwon's gonna have to work to gain the clan's trust if he wants to get at those books. Yano dislikes/distrists strangers in general, but when Jenissi's not looking, he asks if Jiwon has any spells that can make a werewolf's hair fall out.
Jenissi probably knows that Jiwon is way more powerful than any of them and has accepted it and knows that diplomacy and being friends with him is the best plan, but some others get uneasy with letting someone so powerful into their home (not that he couldn’t get in anyway by force if he wanted to). Jiwon likes to do things properly though and he likes Jenissi, so he’d rather be polite and gain their trust and be allies than just intimidate them.
Lmao ofc Yano would half resent him and half want to be him, he’d be *so* jealous of Jiwon having both important and trivial powers honestly.