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Another "adultery leads to healing with a side of revenge" daily drama ... interestingly enough, Choi Jungyoon is in both. In Amor Fati, she is the FL while in Desperate Mrs. Seonju, she plays the female antagonist/adulteress Sangah. Also in both, the ML's relationship with his son is a big plot point. If you want to see fathers fight for their kids (blood relation be damned) , you'll like Sowoo ... he's similar to Jaekyung in that sense.

However, the tone of Desperate Mrs. Seonju is a bit more comedic than Amor Fati and the author liberally starts assigning birth secrets in the second half... some of which feel unnecessary but besides that, the overarching theme of "family vs ambition" is the same!

Another daily drama that features long lost identical twins ... and one twin taking the identity of the other to get revenge on the main villain, who is also an older woman trying to stay in good graces with the "chairman", and is at odds with his (younger) wife similar to Sanwol and Hwayoung. The circumstances are a little different but I don't want to spoil the entire drama!
Highly recommend because Lee Yuri plays the twins and she's AMAZING at these revenge dramas imo.

Another daily revenge drama ... FL of both get revenge by living as someone else, although Jeongwon does a bit more with her new identity than Jangmi does (WAY more) and Jeongwon acts on her own. A bit unorthodox in the sense that the FL isn't all sunshine and rainbows (like Seorin) but in my opinion that's a good thing ... the FL is calculating and ambitious. Which I actually like in an FL. If you want a break from the "bright personality" FLs I highly recommend this...
The ML also supports the FL although unlike The First Man, the ML is aware that he is being used and is okay with it. A love triangle exists but it's nowhere as one sided as the one in the First Man...

Also recommend if you can handle a drama where the majority of the characters are morally grey and not black and white good vs evil.

Same FL (Ham Eunjung) and the drama is fast paced once the revenge actually starts. It does start a little quicker than The First Man, probably because the drama itself is shorter. The FL is pretty active in her revenge ... a little similar to Seorin in the sense that she moves in silence.

They have the same writer, both dailies are centered around the hospitality industry (the third marriage = restaurant, the first man = hotel + restaurant) and Yoon Sunwoo (Baekho) ALSO plays the ML here. Big difference is he has his own secret revenge arc going that's separate from the FLs... Choi Jiyeon (Youngja) is also in this drama, although her character is extremely unlikeable here lol. The FL Dajeong is a little similar to Jangmi at the beginning although she actually pulls her "revenge marriage" off (and story wise it actually makes sense). You'll see a lot of the same tropes used in both dramas as both are part of Seo Hyunjoo's unofficial "Nth Series", along with The Second Husband.
Personally I liked Seran as a villain, just like Hwayoung there's no limit for as far she will go (and boy does Seran go pretty far) and just like Hwayoung she tends to get the upper hand...

Also Ban Hyojung is a legend, period.

Written by the same writer! The plot of Witches Game is like an inverted version of the plot of A Graceful Liar... Mother-daughter relationships and identity switches are a big theme in this drama too. The mother and daughter duo in both dramas work together to get revenge. Twists, turns, schemes, manipulation and (birth) secrets abound, this feels more like watching a game of chess than a makjang drama. There are morally gray FLs (Hyera and Jeongwon in AGL, and Yukyung in WG. Hyesoo is more of a typical FL but she's not a pushover so she's fun to watch)

They also both have relatively high budgets for makjang dramas as well. Both have better than usual cinematography. Oh and if you thought Jin Taeseok is evil, let me introduce you to Ma Hyundeok and Yoo Jiho.