The main couple is really good. Their arcs are good, their relationship is touching, and the actors are excellent.
It's very easy to get immersed in the actors performance. When they're sweet together they're adorable and when they're suffering you really feel both their pain. They're both able to do both micro-expressions and explosive emotion very well. The female lead in particular does a great job with the heart-wrenching scenes and doesn't hold back in the name of looking pretty.

If you're mainly looking for a touching romance with a good couple, this is your drama.
And since it is a romance drama, if you're feeling interested from the synopsis you probably WILL enjoy it. The romance is very good.

The following are just my feelings about supporting factors that I felt weakened it overall and may not bother you at all. Also contains vague spoilers, though I've tried to avoid giving details.

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The background plot turns out pretty weak. In the first season it was actually a lot better. You could follow along pretty well, and while things were still pretty vague and shadowy at that point you could get a good sense of who the primary villain was, what they were probably up to, and why.
Except no you couldn't because the second season throws in a twist that retroactively blows all that to hell and leaves you wondering why the villain even did half of that.

You can sort of understand the goal in the general sense of 'villains be power-hungry, amiright?' , but beyond that it's just confusing.
Why did he focus on the things he was focused on? Why did quietly kill off this character but leave that one alive? Why did he focus so hard on certain things? Even if the goal seems to have stayed the same as you assumed it was before the methods suddenly make a lot less sense. the methods and mannerisms that have been driving the story become muddled. The true villain displays a hyper focus on certain things that in retrospect I can't figure out why he would have ever cared about, not to mention spending a lot of the first season making allusions to a secret he doesn't actually know and is surprised to learn in the second season. He's retroactively revealed to have done things that aren't mentioned at all in the first season and just seem to come out of nowhere in the final stretch. Overall the twist seemed to weaken the background plot quite a bit.

Finally most of the supporting cast didn't get much in the way of finishing out character arcs. If they were struggling with love, they ended up alone. Most of the platonic support characters just got killed off. And the minor female villain, despite having spent the drama ruining lives and weaseling out of death two or three times essentially gets a mook death. It felt like it would have been better to let the petrification death have been her true end, since that at least involved her being held accountable by some of the people she'd wronged before the end and then suffering a fate she'd inflicted on someone else.