So he drank the Nux's blood does that mean he is the next Nux? I thought the Nux was also ...

I don’t think so. The original plan was to give the Uke Nux’s blood and turn him into a vampire. They never mentioned he’d become Nux because of it! I think there’s more to becoming Nux than just drinking his blood. The Seme drank it but didn’t necessarily do the ritual* to become Nux I think?

Maybe it only works on those who are a vampire. Director is a human, so maybe it's different.

so confusing, watch everyone just turned into Nux

Nope. The next Nux is the blonde guy cause the actual Nux bit him and gave him his power. The director is human, he drank the blood of Nux so that the brown hair can now drink his blood and wont die.

Ahhh thank you so much for all your replies! I really appreciate it. I just have one more question... then you know the blonde long hair guys brown hair guy he sleeps with, did he give the seme the blood of the Nux so he can help the uke then? No other intentions? Because I thought he wanted to stop the blonde hair guy from becoming the Nux.
Thank you all for your replies

He gave the blood of Nux to the seme so that the blonde hair wont have any contact with the real Nux cause he is desperate for Nux's blood so he can give it to Doyoon. Technically, he did it for the blonde hair.

At first, initially I believe the brown haired guy wanted to keep the blood of Nux to himself because he didn't want long blonde hair guy to save Doyoon, because brown hair guy knows blonde hair guy is doing it as a favor to his deceased father out of guilt. Part of him also wanted blonde hair guy to look at him, and stop caring about Doyoon. So I'm guessing because unexpectedly, now blonde hair guy will become the next Nux, brown haired guy didn't expect that sort of outcome so he decided to give the blood of Nux he received to the seme. He probably had a hunch that the blood of Nux injected into a human would be drinkable by a Dhampir (Half Vampire Half Human species), also because he wanted blonde haired guy to let go of Doyoon and his guilt. Sorry that was explained poorly so it must be confusing, lmao.

No that was explained perfectly! Thank you all for your explanations! I really hope we get more info about the brown hair and blonde hair as well! (▰˘◡˘▰)