I didn’t hate it, but unfortunately I don’t think I understood the story they were going for? Several confusing…
I think the main plot was Sun trying to connect with others, and figure himself out. What we find out is that everyone is living this double life. Not unlike himself. He's a smut author but appears to be an asexual virgin. He certainly doesn't know how to reach out to others, but he's at least trying in his own way.
I think this is the main idea.