You're saying that you're not defending the red haired guy but it seems that YOU ARE justifying his actions, the read haired guy treaded suha like sh**, do stuff that makes him suffer, manipulated him into making suha think that he's inlove with him, suha is not the greatest character but he has reasons, the red haired guy is behind all of this, don't get it twisted and stop gaslighting suha just like the way that guy did, he literally traumatize suha into thinking s** is a normal thing, and you can just do it with anyone else.
Dont forget how that guy hired people to sexually harass jiwoon.
Lastly, none of this character are pure even siwoo, suha's friend, stop being selective when it come to your moral, it just happen that the red haired cu** is the worse, and he don't deserve any ink or any time of the day, we don't need or want his redemption arc or any sh** related, he is the worse, and don't you ever compare suha to him ever again.