Surprisingly enjoyable! I started watching this out of boredom and ended up finishing within a few days. For me, it has just the right amount of makjang to make me wanna keep watching without it being absolutely crazy. I didn't have any expectations going in, but I felt pretty impressed/satisfied by the end.

Like a lot of other commenters have said, there isn't a ton of romance in this show. I would say the family melodrama has a bigger/more prominent role than the romantic bits.

STORY:
This lakorn has a bit of a slow start, as all the pieces of the story fall into place. Once the twins meet, which I think is about halfway through, things definitely get spicier. Most of the characters (except Pa, Neung's stepdad) are rather sympathetic. I appreciated that (most) of the 'evil' characters had some dimension, they weren't just raeng for no reason.
I liked the way they dealt with Neung's character. She does a lot of deplorable things, but she also very clearly has a mental problem and a conscience. I think they did a nice job of making her a sympathetic character, even as she spirals out of control. Song isn't as compelling, since she's already a good, nice person, her character doesn't have a whole lot of room to grow. However, she's still likeable and she's one of those rare nice-girl characters who isn't super weak. Her relationship with Ard is quite cute, I wish we got to see more of them together.

Also, Ying Yuot is an absolute saint. Seriously.

ACTING/CAST:
Everyone did a pretty good job here, I think! Min especially impressed me; she did a really great job differentiating Song and Neung. I think she did an especially good job with Neung's unhinged moments. Oftentimes, I feel like those scenes can get kinda cringey, but I think Min sold them pretty well.

MUSIC:
Just your normal lakorn music here, I think. Nothing special, but nothing bad.

REWATCH:
Honestly, this show doesn't have a lot of twists. It's pretty straight-forward, so I think it should be easy to rewatch it without losing too much enjoyment.