You know how big brothers are.

[ Jinwoo's a big brother, he knows the deal! Of course there will be the usual warnings and overprotectiveness. ]

Lynette is my twin, but she has quite a different personality than me. I find her incredibly charming, but I'm quite biased in the matter. I think that you two will get along though, and not actually in any way I'd really be worried about.

[ Though if anything, she might bully him more than Lyney ever would. ]