I think this might be one of my favorite webtoons, actually. It's basically the epitome of "beautifully tragic" and it feels exactly the right length, even as it left a lot of endings open. (This is how you successfully write an open ending!)
I particularly really like how the witches are portrayed here, beautiful even in their inhumanity. I think it's one of the most successful portrayals I've ever seen of a group of supernatural, immortal beings and how they live their life. And even as they're wonderfully inhuman, their plights somehow still manages to tug at the audience's heartstrings. I'm not a cryer, but this webtoon definitely made me tear up a few times.
Of course, if you're expecting this series to be about Philippa and Colin, well, it's not, really. It focuses on those two the most (especially in season 1), but it's primarily about the witches themselves and their individual loves and how they live through human society, even as human society remain hostile to them.
It also has some really neat critiques of sexism and really leans into the feminist reclamation of witches and what they represent. Definitely an unexpected bonus! It's also not heteosexist at all, and while many of the witches fall in love with men, some are clearly in love with women, and one witch is only interested in sweets (ha).
And, it's a blink-and-you'll-miss-it moment, but Colin has reincarnated into women before, and Philippa still loved him in the same way, so these witches definitely don't seem to take too much stock in gender. Or, at least, Philippa doesn't.
So, yeah, definitely worth a read, particularly if you're interested in tragic yet beautiful stories. ...There are some happy endings for some of these witches and their loves, but even those are kind of marred by... the inhuman immortality of the witches. So even with the happiness, there's always a tint of tragedy running through them, but that's what makes this series so worthwhile, I think.