
Yeah but the question is what is healthier? A life with no purpose or one with it? If this guy succeeds on making the MC have healthy habits, can he solve his depression next? Being healthy ≠ happiness. He feels calm and happy working and without it he feels like someone without use. Even if he gets a love life, he’s not going to be happy with living. Living just for a romantic partner isn’t romantic it’s just dissolving of life purpose. If he’s happy with what he’s doing then he’ll die happy, sometimes that’s better then living longer.

What are you talking about? Living only for work isn't healthy at all, He wasn't healthy, not happy before, overworking isn't something good, he hast to occupy his mind or body with something else, he can't be working nonstop, someday he's gonna collapse, the captain is gonna help him, if a romantic relationship arises from that, fine, if not, it's also fine.
Btw, I recommend you investigate about "karoshi", it's death from overworking.
Maybe I have a mc syndrome but like can this guy knock off his hind legs, like sure the guy needs Ehealthier habits but this knight commander is not someone who gets to dictate his life, he’s not his parent, he’s not his coworker, he’s not his boss, he’s not his boyfriend. He’s just another guy causing him stress.