first off, Suu is not in his right mind, as the prince is an energy source for him, much like Suu was for Saharah. So, when Suu greets him at the end of this chapter, is blindingly attempting to sate his hunger.
Second, Suu still has plans to kill the prince, at the moment. But Suu is not one to rush into things or do things without plenty of preparation. He knows that he will need the prince to trust him in order to pull through with his plans. The last time he showed mistrust or hatred to the prince, he met severe punishment. his memories were stripped from him, he imprisonment was stricter, etc. he's not going to make the same mistake twice.
Ofc bcs he has “feeling” to Hwaryun, Back few chapter, Suu constantly struggles between wanting to truly fall into for him just like he does to Nadan, they both desperately want to trust and be trusted and that’s impossible too. Suu still working for that consort btch., and did you forget Saharan is obsessed with Suu too, he even say to kill Suu.. as i try to read latest raw, Suu and Saharan escapes together but still Suu thinking about Hwaryun.. Well this series really complicated tho, where the palace story really takes precedence over the romantic relationship.
if suu really hates the crown prince WHY THE FUCK ISNT HE SHOWING HATRED TOWARDS HIM?! AND THEY'RE FUCKING EVEN AFTER THEY BETRAYED EACH OTHER PLENTY OF TIMES?! oh my god I am so fucking mad about the story line. GIVE SUU A BREAK! and why is the crown prince treating suu like shit if he really does have feelings for him wtf. I want suu to kill that damn prince and everyone who used him and live a happy life with that cute dragon. THE END. although suu can really be a pushover at times. I thought his character was supposed to have a strong mentality. why's he acting so soft now? ugh