Okay trust me on this but the link is on some random guys insta page lolol I actually had a different site with the full novel on for free but my laptop literally perished forever and I never found that site again ╥﹏╥
Then I found this reddit post https://www.reddit.com/r/undertheoaktreebook/comments/1t6w4e5/where_did_you_read_the_forgotten_field_noveli/
and that's where I found the insta link - it's a google drive link (yes I did just download a random google drive link without checking but I was desperate..)
The insta link is https://www.instagram.com/sakurawarey/
Hope that works!!

Its LONG and I haven't finished it yet but poor Thalia :(
It's probably one of the most slowburn villainess stories I've read so far (which I'm always down for let me sit in angst and yearning) but at the same time Varkas is a bit of a pain LOL. Like when we get to the parts where we see his reasoning behind his actions it starts to piss me off lolol I wouldn't call how he feels right now love and I don't think he sees it that way either but he definitely cared for Thalia but even at the point I'm at in the novel where he truly cares for her he never TELLS HER. AND THAT PISSES ME OFF. Someone like Thalia has been burned and scarred by so many people and even a few words of reassurance would mean the WORLD for her and he says NOTHING!!
Anyway, it's interesting reading the webtoon now that I've read most of the novel and knowing Varkas wasn't completely unfeeling (it's a low bar but I've become so attached to Thalia that I get excited over the littlest crumbs of affection she receives when she deserves so much more :c)
Also her guard knight is THE BEST CHARACTER no competition I love that cutey patoot!