Also, in my opinion, he's always been obsessive, possessive and desperate for Yujin... it's just he tries to control it more in the past. Now, idt he'd try to hide it and i also think his demeanor would change. Back then, he would let Yujin do whatever he wants because he knows Yujin would hate being encaged. Now, i think he would be too scared to trust Yujin. Probably having someone follow him around or something. Idk bro prob got trust issues now
Honestly, its definetly gonna be angsty and painful to read this season mainly because both our main characters are mentally ill in their own way and struggle with managing and expressing themselves in a healthy manner. But idt either of them is red flags or ever will be red flags... They both have their own baggages and since the beginning, they've always been gray. Not really saints but not evil either.
Aaron is someone who lack emotional understanding and i believe Yujin is the first person that has ever made him react or feel something which is why he's so hellbent on having him.
While Yujin is someone who feels too much which makes him end up putting up a wall aganst everyone. They're just two people that's been hurt and somehow find comfort in one another. They've done their fair share of good and bad deeds but i think that just proves they're humans

I've reread the series recently and honestly, i disagree with people calling him a green flag. His desire for Yujin is closer towards obsession even in the beginning. He forced his way into Yujin's life, used a bit of petty tricks to get him to agree to him and they end up tangled up together. However, he's not red either.
In my opinion, he has never done serious harm towards Yujin. In the beginning, Aaron treats Yujin similar to that of a prey. He even refer to what his grandfather taught him often about how to hunt. But when he realize that wouldn't work on Yujin, he decided to change his approach. He decided to go at Yujin's pace. He doesn't force himself in, merely arrive and wait to be let in. Not once had he done something to go against, harm, or violate Yujin he always wait for consent often time even letting Yujin use him to blow off some steam.
I understand the visualization they've depicted on him but honestly, despite all his anger after Yujin ran, Aaron didn't even know what to do if they do meet again. I remember for the ending of the season someone referred to him as "a dog that's been abandoned" and in my opinion he is acting exactly like that. He's desperately searching for Yujin, having restless nights waiting for him, trying his best to go about the day without him even using alcohol to soothe just a bit of his frustrations.
I believe he's simply angry that he's been left behind but from the beginning, he wasn't someone who is capable of harming Yujin. Because despite his obsession, Aaron loves him too much to harm him. He aways adjust himself to what Yujin wants rather than forcing him to do what he wants.
I am more covinced after the latest chapter because all of the baggage Aaron's been carrying melted away the moment Yujin held him. He thought he was angry, angry enough to destroy Yujin. But the moment he saw him, he couldn't even think of harming him. It's normal for someone to be incapable of thinking straight especially when they're depressed and angry i think all the things he said is just simply driven from all his frustration.
Especially since after he brought Yujin back he still didn't do anything that violates him. If you pay attention to Aaron when Yujin was waking up, you can see he's fully clothed. Yes, Yujin's body is riddled in marks. But honestly, it reminds me of a dog when their owner comes back and they lick them all over and marking their territory. Especially if you pay attention to the markings you'll notice this
Ofc, i could be wrong idk what the author is thinking or planning. But at least in my opinion, i don't think Aaron will harm Yujin. He will most likely be possessive, desperate and angry but im don't believe he would go so far as to r*pe him