Consigli

Both have dark themes
Both are about martial arts
Both have red ranger dad that turned to the dark side
Both have ancient feud clans
Both have Chinese aesthetic

Both are space detectives
Both crossed over in a movie
Both appeared and teamed up with Kyuranger and Gokaiger

Both are Police themed series
Both are fighting against a crime organization
Both have a mix of both mature and silly tone
Police rangers are red, green, and pink

Both start with 3(Male Red and Yellow and Female Blue)
Both of the 3 were survivors of an attack at their school
Both villains are galactic themed
2 rangers join the team
The 3 rangers theme are (Falcon, Lion and Dolphin)

Both are shows about transforming into past heroes
Both appeared in Kamen Rider × Super Sentai: Super Hero Taisen

Both feature a team color (red, blue, yellow, black, white)
Both have dimensional villains with monsters mixed with items and animals
Both have ranger girlfriends that turned evil

It's too early to tell what direction Mistress is going for but based on what I've seen so far, it shares certain similarities and vibes with Avengers Social Club.

Both dramas revolve around these four interesting people, mostly middle-aged women (Mistress's ensemble is portrayed a bit younger in comparison, though), who are bind by this unique and complex relationship—friendships that are in one way or another linked to revenge, which is likely provoked by their respective husbands, lovers/love interests (or [maybe] ex-husband/lover, in the case of the Mistress), and/or [possibly] other people. This aspect of the drama is a lot clearer in AVG since its focus is more on life and friendship (so it has more comedic and feel-good elements), unlike the Mistress which [might] focus more on mystery and romance (so it has more suspenseful and darker elements).

Moreover, both dramas are consist of only 12 episodes, so they are definitely binge-worthy!

Both Dinosaur theme Super Sentai
Both have a "evil 6th ranger"
Both were in a crossover with Kyoryuger
Both feature a Red Tyrannosaurus Rex and Blue Triceratops

Both are Magic themed series
Both owned by Toei
Both fight mythical monsters and beings
A "red fire" wizard protagonist

Both were adapted into Mighty Morphin Power Rangers
Both were written by Noboru Sugimura
Both fight ancient supernatural forces
Female ranger is bird themed
A Ranger have a Father who went to the dark side

At first, they may seem different: Love O2O, being focused on gaming and college life while It's Okay, That's Love, being more focused on psychology or healing.

However, after watching both of these great dramas, I'd say they somehow share a similar vibe, which may be because they both have:
-natural yet off the charts chemistry between the leads
-strong and mature relationship, where both sides support, respect, and trust the other person through thick or thin
-skinship and kissing scenes (or fluffy moments, in general) enough to make you root for the main couple (although IOTL is a lot better and intense on this one)
-admirable character and/or couple development (the lead/s definitely exhibit growth throughout the episodes which further helped strengthen their relationship)
-happy and satisfying ending

*there are probably more similarities, but these are all I could think of right now.

The two female leads time travel into the past, they have fun.
The male leadsls deeply fall for the girls.

These dramas are similar, because they both include: vengeance, violence and romance. Main male lead is agreesive and cruel (because of the past, misunderstanding) towards to a female lead.

Both based in the fashion world and include both work related and romantic challenges throughout. Both female also leads seek for perfection.

Both are Ninja series owned by Toei
Both fight demons/supernatural
Both have a American Ninja
Both appeared in Ninninger
Heroes inherited power from relative or descendant