The problem is that he's not very interesting either (for now). Sure, the MC doesn't need to be good or likeable, but he needs to be 1) somewhat relatable and 2) make you want to follow his story. If he's a complete lunatic whose actions are incomprehensible to most people, the manga will probably have a niche audience at best. But if he is easy to understand and boring, it's not going to work either (unless there are other characters that can carry the story).
In this case, I think the MC might be TOO relatable for all of the wrong reasons (again, for now). He is confronted with a choice between righteousness and convenience, and - rather than doing the right thing or going full villain - he keeps waffling back and forth, not wanting to give up on his stolen privilege but not fully committing either because he feels guilty and he doesn't want to see himself as a bad guy, so he keeps making excuses and lets the opinions of others drive him rather than to decide for himself. For most people, that's very recognisable (who hasn't ever felt guilty over something, but pussied out when they had to make a hard decision?), but it's also something they are not proud of... and very few people like to read about a character that reminds them of themselves in their weakest and most shameful moments. We read stories to indulge in a fantasy, not to see our own mundane flaws reflected in an equally flawed and mundane character who is basically just going along with whatever direction his entourage pushes him in, especially when said character is supposed to be a hero. That's just boring and uncomfortable, and not what most WSJ readers signed up for.
(I still hope he tells her before publishing the first chapter. Watching good people get pushed into doing bad things and suffering for it is about just as depressing as people doing bad things and getting away with it, IMO. And it's clear that his guilt is affecting him more and more already.)
