Honestly anon, I have been going back and forth on this in my head because they are both kinda crazy just in different ways KJSDFKSJDFDSF but! I think you're question has made a good point in showing there is distinction between the two - being possessive and being jealous, although linked, are not necessarily the same thing! I think generally speaking, there is a consensus that Geon is the more possessive and the more jealous one but I tend to disagree.

I think Geon is definitely the more possessive one, 1000% he's been wild, saying shit like 'my man', always wanting to be the one who knows the most about Maet in the room, hugging, touching, his very obvious disgruntlement at certain moments when other members are cuddling Maet... I think more than anything he just struggles to share. And if we go with the line of thinking that Maet is his first serious love (which is what I believe to be the case), it also makes sense why he can be particularly obvious and shameless with his possessiveness. I don't think it's about other people or insecurity that Maet will be taken away from him - more just? That headspace you get when you have your first love, where you just want to be enveloped by them and vice versa and just struggle to remember that other people are around.

Whereas, I do believe Maet is the more jealous one. I don't think we've had much opportuntiy to see it in a group setting because generally speaking no-one in the group is as touchy-feely with Geon (I think in general he is picky about who he is touchy-feely with) and they've been so obsessed with each other that there just hasn't been an opportunity as of late for another member to mess with them in that way. But I can't lie I would love to see a member mess with them in that way just to see how Maet would react bc I think it would be fascinating LOL I think the best example we have is probably Maet wanting that 1:1 date so bad (and eventually getting it, good for him), I think this can also be seen as possessive but I feel like it came more from a place of jealousy because he wanted Geon's attention to himself, hee's very much used to getting Geon's undivided attention (and he seeks him out a lot to check he's paying attention), and I think he gets jealous of others when Geon is focusing on anyone that isn't him LOL oh and also! interactions with fans. Maet reminding different fans that Geon is his, and the MARRIAGE THING?!?! Like only wanting to marry a fan if it means he can marry Geon. Like ok.

So yeah! Those are just my thoughts, thank you for asking as always <3