Johnny went from shameless homewrecker to low-key biggest JinAkin shipper. Talk about growth. I'd love to see his development in a possible season 2 especially with Naru as his foil. And who is LT that has Jade wrapped around their finger. And did he work out something to get Akin out of his early retirement/break from acting. Not to mention our leads' relationship. I really hope they make a sequel.
I think it's a carry over from the original manga. They're more like cupid wings and usually appear (to us) when Jin is being a super green flag. From when he's at his sweetest to when he's being protective - like when he shielded Akin from the falling scaffolding or holding him from to roof edge.