Responses
I don't really see it as stalking at all. They are friends, comrades, and are on a dangerous journey. She could be killed at any moment. She is strong but she is not invincible and Hak can take on more damage than she can. He is protecting her as a bodyguard and someone who cares about her.

II have been wondering ,but sometimes hak comes to save yona in the most unexpected times like he knows she will get attacked or something xD. Feels like he's following her constantly. I mean don't get me wrong I love hak , its just that I wonder to much at times (⊙…⊙ )