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She doesn't have any responsibilities that have to do with the dragon king, nor does she need to care for him. He fucking KIDNAPPED her without caring about her feelings, so why should she care for him? The prince, though in his own way did kidnap her, at least cared about how she felt. Also, the Dragon King does not care for Sena as a person, he simply sees value in her as the dragon caretaker. Had she not been one, he never would've cared for her. His feelings for her are shallow. He also pushes his thoughts, feelings and expectations onto Sena, and that's more of a burden for her. I understand why you guys like him though, 200 years of waiting is not easy by any means and I also feel bad for him. But none of that is Sena's responsibility, nor should it be.
Nnooo but why would you make the dragon the 2nd ml. My heart goes out to him. Hes waited for her forever! Why!