I've looked around and found out enough about the LN to the point I understand the plot an...

SPOIL ME PLS

Gladly lol I'll just rattle on for a bit first to avoid spoiling someone who might not want to read this. so! Spoiler alert!
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Basically, the current story and events end in a loop. The FL and ML go on about their business being cute and all, but their death is unavoidable. This time, however, ML is the one to find the FL (he goes back to search for her because it's storming outside and he remembers she hates storms) already dead. The same thing that happened to the FL happens to him; he tries to rescue her, finds she's cold to the touch and already dead, then he himself passes out and dies -- only to find himself back at square one, with the memories of this life that just ended. So, now, he's in the same predicment that FL was in. He grows up, goes to the academy, finds her again... and discovers she has no memories, and thus, acts very differently towards him. The relationship between the two of them goes about as you'd expect -- the ML is now the one in love, while the FL is not (since she doesn't know him yet), so this time the script is flipped and he goes after her. IIRC, since he "wakes up" before the time spent in the academy, he makes sure to get the FL's family to stand out more between nobility so that there's not many complaints when they marry.
Anyways... all in all, as the story progresses this time, we learn a lot more than we did when following the FL. The plot reveals itself to be a time loop -- but one that has been going on for far longer than we can initially think, and one that doesn't involve only the ML and FL. This happens because of a curse related to the Dragon Tree; in the first time the characters are living their lives (i.e before the loop turns into a loop), some kids end up destroying a branch of the tree, and try to get rid of it by burning it in the fireplace of the fated room they seem to die at. It's unclear which main lead dies first in their first time and the exact order that follows of who remembers and stuff -- but we also learn this curse does not only affect them, but Miguel as well. This is because the curse is aimed at lovers, intending to make them prove themselves (not clear *how* they're supposed to do that), and thus a friend of said lovers gets brought along to act as their "judge". As such, Miguel never once lost his memories; he simply sees his life reset again when ML or FL die. Miguel says he's tried intervening in different ways before, but when he tries to do something, ML and FL end up dying even earlier -- so he just stops trying. He has no clue on how to stop the curse, so he just hopes ML and FL figure it out themselves. He's in a really tragic predicament tbh.
By the end, they seem to get a happy ending though. I'm not exactly sure what they do to get out of the curse, but in the "current" run of the loop -- the one where the ML remembers, right after our first story told by the FL -- a lot of "side" stories, like that of Yana and Azraq, get solved, and then the curse is lifted too. Usual happy ending stuff, ML and FL are happy together and then seemingly marry and have a daughter. A little strange bit, though, is there is a moment kind of like "Renesmee and Jacob", where in the last chapter thei daughter of ML and FL seems to be ""in love with Miguel"", as he takes care of her sometimes (as a close friend of her parents, he's kind of like her uncle). I don't think it's a weird thing where it's taken seriously, and is rather just a cute little childish infantuation. But oh well! Everyone gets their piece of a good ending so I'm happy...

Now...

Currently the Light Novel has 3 volumes and is said to be finished (ANiList and other such sites count it as finished), but I've heard people say there is a 4rth volume coming. The ending I talked about is related to the Web Novel (and it's 200 chapters) -- and I'm not entirely sure if the 3rd volume of the Light Novel contains this ending or if it cuts off and leaves the story to be finished with a fourth one. Maybe the Light Novel version gets cut short into a "bitterseet" ending where the curse isn't lifted, I'm not sure. I can't get my hands on that volume yet so this is all speculation.