As a gay myself, I do have a list of men that ping my gaydar!
Gong Yoo, Lee Dong-wook, Im Siwan (poor guy, he has to be tired of people always being so in his face about his sexuality lol) and, I may be alone in this, but Kang Ha-neul. I know they are mostly all on Squid Game but since it is the last series I watched, it is the recency bias working here lol.
They are not the only ones on that cast that ping for me, but I do have to say it is more of wishful thinking, like Wi Ha-joon and Lee Jung-jae (yeah I know).
Not saying I am right or that they are all gay, I know bisexuality and not labeling is as fair. But just wanted to add my two cents. I am a lurker too. Hi.