But was he ever actually introduced as a green flag, or did readers just assume that because of his devotion? Obsession and genuine love can coexist, and being devoted doesn't automatically make someone a healthy partner. I'm not defending the noncon, but readers mistaking obsession for devotion doesn't mean the author suddenly changed a green flag into a red flag.
This is why the green flag/red flag/black flag discourse is so annoying. It reduces characters to moral labels.

this author trying to incorporate noncon cus wdym he kept fucking him when he was sleeping ? he is literally introduced as green flag why do he pushing eunsan beyond his limit during sex no listening to shit he says ?