The World of the Married (2020)

Both dramas have quite the dark theme and are slow paced with emphasis on getting to know the characters, their life and emotions rather than action.
Both husbands keep secrets from their wives. "The World of the Married" focuses on the female leads character and how she deals after finding out the truth.

Mature protagonists (adults)
Infidelity of partners
Parents behaviour affects their childrens
Greed for connections to social elite, power and money

Sakuraba Haruma's childhood friend Inukai Shuji was a cut above him in every way imaginable, living out the glamorous life bestowed upon him. Haruma, an unassuming salaryman, has lived his every day clutching onto his inferiority complex, existing only in Shuji's shadow. One day, Haruma coincidentally meets Shuji's wife, Inukai Reika, who Haruma has always secretly admired since his high school days. With feelings of envy, jealousy, and more, a "secret" is born from Haruma's repetitive days.

Suguri Toko is married and they have a lovely daughter. She doesn't have any major problems in her life. One day, Toko meets her ex-lover Kurata Akihiko at a friend's wedding. They haven't seen each other in 10 years. Toko indulges in a sexual relationship with Akihiko.

Both are affair dramas except for this main reason: THE CHARACTERS ARE TOTAL OPPOSITE. The more you watch them, the more you understand them, the more you reflect about life. Actually, it is not a cheating drama for me. Rather a healing romance drama about four people entangled in a dangerous web just to show people that LIFE IS THIS SWEET. After watching, it will make you ask yourself, "How are you, my sanity? Stop messing my thoughts about life and love." My all-time favorite Korean Drama. No one beat it yet.

It revolves around cheating and its also related to marriage/betrayal.That's all I can sayby now .
I really like these type of dramas so Watch it :D

Mujeres que sufren y finalmente se empoderan. Ambas te hacen sentir angustia, emoción continua y frustración al ver cómo sufren. Es una historia madura.

Both are about a forbidden love story between a man and a married woman. Both have r rated scenes & recommended if you like secret love affairs type of drama/movie.

2 months after their wedding, Yeon Yi's husband, Jin Woo, gets into an accident and falls into a coma. During this time, Yeon Yi's life shatters from the seams. She misses her deadlines for work, while she has only videos of her wedding to comfort her.
Then Yeon Yi waits at the airport for Jin Woo's brother, Jin Ho, whom she has never met before. She is stunned when she meets him, because Yeon Yi never knew Jin Woo and Jin Ho are identical twin brothers. Although Jin Ho and Yeon Yi's relationship is cold at first. they soon become attracted to each other. Their relationship becomes even more volatile, when Jin Woo suddenly awakes from his coma

Everything seems perfect in the life of the successful family doctor and associate director, Ji Sun Woo. She lives happily in Gosan with her handsome husband Lee Tae Oh, whom she financially helped establish an entertainment company, and their teenage son, Joon Young. However, the perfect image of a happy, loving family life shatters when she discovers that her husband is having an affair, and even their mutual friends are helping him conceal it. Devastated by the betrayal, she sets on a path of seeking revenge and recollecting her broken self.

I watched the first 3 episodes and immediately thought of 'the world of the married' even thought it may not have the same plot, the female lead in 'My Happy Ending ' seems very alike to the female lead in 'The World Of The Married'

A love story affair with a bit different storyline & plot with mature sexual content but both is worth watching drama. If you like mature love affairs story I definitely recommend this drama.

Chihiro is depressed and obsessed with his own mortality. Him and his wife, Yuri, decide to take a trip to Bali, Indonesia to see his pregnant sister, Kumi. They hope the trip can bring about change.

Everything seems perfect in the life of the successful family doctor and associate director, Ji Sun Woo. She lives happily in Gosan with her handsome husband Lee Tae Oh, whom she financially helped establish an entertainment company, and their teenage son, Joon Young. However, the perfect image of a happy, loving family life shatters when she discovers that her husband is having an affair, and even their mutual friends are helping him conceal it. Devastated by the betrayal, she sets on a path of seeking revenge and recollecting her broken self.

A love story affair with a bit different storyline & plot with mature sexual content but both is worth watching drama. If you like mature love affairs story I definitely recommend this drama.

Takashi is a psychiatrist who has shut down emotionally after his wife's death, and Ayako is his patient. They plunge into a torrid love affair that helps the love-starved Ayako and provides solace to Takashi. However, their love becomes riddled with jealousy and possessiveness.