V.I.P (2019)

Both dramas are starred by Jang Nara

Both dramas are set in high-end office setting (Good Partner in high-end lawyer firm while VIP in high-end department store office)

Both dramas have Jang Nara dealing with unfaithful husbands and annoying mistresses

Reason: This drama involves high-stakes action and intrigue, similar to Project Y. It follows a high-profile detective and his team as they deal with crimes that affect the elite class.

cheating on wife, affair, love triangle, give the same vibe as VIP Kdrama must watch if you like affair and romance.

Both dramas deal about infidelity and marriages being tested. Both show the struggles of a woman, who has to find her way out of a huge gap that opened up.

VIP is a drama less than half the length of My Unfamiliar family. However, they share many similarities.
My Unfamiliar Family is a family drama so it focuses on all family members. Some of these family members have/are cheating on their partners/spouses. And, one of the family members is suffering from depression after getting a miscarriage.
VIP is a drama that focuses on a woman who knows that her husband is cheating on her. The whole drama, she is trying to find out who her husband is cheating with. The wife (the main character) also suffered from a miscarriage.
Both of these have the added bonus of having SHIN JAE HA in them. And in both, he plays the important role of accidently uncovering secrets and comforting the main characters in times of need.

Both dramas revolve around cheating partners.
In both dramas, female leads are very powerful.
Both will investigate on they husband.

No murder is involve but it's a more realistic story

They are both realistic but dark at the same time.
Both dramas have strong leader females and a serious tone

Both dramas deal about a married couple that has to work out the consequences of betrayal. In both dramas the couples work/are from the same business. Both dramas have strong female leads. Generally the theme infidelity is well developed in both dramas.

Both have:
- themes of the political side of the corporate world
- lead characters struggling from the affair of their spouses
- binge-worthy episodes