Right? It's so intimate! This is the only one I've read that has that feeling. If you know of others like this, don't be afraid to share em
I don't remember any that has both feelings (too deep + intimate) like WOW, but one that I think that gets the closest is Down and Dirty.
And here's a few others that are 'kinda/not really' like that:
1. Here U Are (very pure, very cute and well written)
2. Shangri La no Tori (it gets to you in a different way... A lot of complicated feelings)
3. Our Sunny Days (masterpiece, healing in every chapter )
And if you're also into straight romance, I really like My reason to die, Just twilight and Purple Hyacinth (not really romance... But leaves you on edge for sure + if you read though the Webtoon app you even get BGM, for free )
Everytime I (re)read this one I feel like there's too many feelings and deepness in the storyline. Sincerely, I can feel their chemistry from episode one and every chapter feels like I'm intruding in their relationship, kinda like I shouldn't be reading and invading their privacy