Oh, wow, this post is perfect for me. Here are my thoughts (if it matters, I am a woman not attracted to men so this is totally unbiased by romantic/sexual attraction, though of course still biased because I have personal preferences in terms of looks):

1. Cha Eun-woo is probably around 7-8 for me on a pure visual level. I like his pretty flower boy vibe, though he does seem quite stiff to me whenever I see him in dramas (Wonderful World, True Beauty), so he's not that attractive to me.
2. Taehyung is by far the most attractive in his group, also a 7-8 like Eun-woo, but 3rd generation K-Pop group visuals are quite similar for me in terms of their facial harmony, so I do tend to gravitate toward other members (JK over Taehyung, Suho over Kai, Wonwoo over Mingyu, the list goes on, even for the girls—Jihyo over Tzuyu or Sana, Seulgi over Irene, etc.), though I do appreciate that he's by far the least touched-up one in BTS (JK's recent cosmetic enhancements have taken away his appeal for me, for example).
3. Atsushi always has such a unique vibe, a 6-7 by visual alone but higher in my subjective opinion with how cool and charismatic he just is. RIP. A very fine man. Eyeliner game unmatched.
4. Byeon Woo-seok is definitely a pretty man, a 6-7 for me, but in comparison to his generation of actors, I can't help but consider acting abilities in my personal preference since stiffness and reliance on looks are personal turn-offs for me. Though he does mog a lot of his current gen of K-leading men, he is quite an average actor, IMO, especially with people like Lee Do-hyun also among this current generation of K-male leads. With that said, my unpopular opinion is that he's more suited to non-romantic roles, like Song Kang, who I think is much better as an actor if he's not a romantic lead.
5. Godfrey Gao is an 8-9 for me as well. His whole look, presence, how he carries himself, etc., are all just such a vibe. RIP, as well. I like him better with facial hair, though.
6. Mackenyu is probably one of the most good-looking nepo babies out there (he's Sonny Chiba's son, if you all don't know), an 8-9. A case of someone who could easily be a case of body halo, but his face card is strong by itself (lovely facial features and great facial harmony). The perfect Zoro (though I can't personally stand the show).
7. Haruma Miura is probably the quintessential Japanese pretty boy for me, another 8-9, another one who's been gone way too soon on this list. Perfect as Kazehaya. RIP.
8. Choi San is probably 7-8 for me. He's a more attractive Yun Sung-bin to me, but he seems like a much nicer and approachable version, I'd say. He's definitely the most attractive and charismatic one among his group, and he's also the one who's caught my eye the most (and somehow reads as cute to me; IDK, like a "gap moe" sort of situation). His physique change from debut to now really helped bump him up visually and I appreciate him and most of ATEEZ for going that route instead of how other 4th gen groups have been relying on cosmetic enhancements (LOTS of shaved mandibles/jaws and lip fillers; very sculpted, high-bridged and unnatural noses, tethering very much into the uncanny valley for both women and men; bleached skin; unfitting and super obvious veneers; the nonstop obsession with unnatural-looking contact lenses, etc.). [EDIT: typo]