Love in Sadness (2019)

almost similar but in Love in Sadness her husband cares only about his wife wherein in Let Me Introduce Her he cares about his view what others things.

Both shows have the same premise of a the FL trying to escape an abusive husband by getting plastic surgery and running away.

However, in LMIH, the FL ends up with amnesia so she must remember who she is first. There's also children involved and, overall, it feels more "Hollywood" (with the FL reminding me of the movie "enough").

Whereas in LIS there are no children involved and the antagonist is a lot more complex and developed. The FL also displays signs of intense PTSD and the ML is a lot more flawed, in that he also feels overwhelmed by the situation (since he gave the FL his dead wife's face).

same story almost hot and melodrama until you may crying . the women on both drama want to save her life and she find love one more time for being happy

Although Missing You is not that dark neither abusive but still it gives some similar vibes.

In Missing You as well as in LIS the SML will do anything to keep the FL with them.

Missing You is the story of a girl who gets separated from her childhood love due to some painful incidents and misunderstanding. The SML saves her and does everything possible to keep her by his side whereas the ML tries very hard to find her and bring her back in his life.

If you are a lover of obsessive love then you will like it for sure.
Highly recommended...
Hope this is helpful...

they're both similar in the sense that the female lead is trying to run away from their "abusive"/controlling partner. Also there is like a triangular love affair situation that is like going on. Although they differ in other ways, they both give off a similar vibe

Kanzaki Miwa is married to Kanzaki Hiroki and is a full-time housewife. She used to work for a large company but made the difficult decision to quit her job and become a full-time housewife in hopes of having a child. But her marriage life isn't going very well as her love for her husband has cooled considerably. Hiroki acts like an ideal husband when around others, but he speaks harsh words to her when they are alone. She lives her days like a bird in a cage. One day, Miwa meets her childhood friend Fuyutsuki Ryo, whom she hasn't seen in years. Back then, Ryo was like a hero to her and loved by her. When she was in trouble, he always came and helped her. They make the fateful decision to spend the night together, and Miwa later finds out that she is pregnant with his child. She doesn't want to divorce her husband and become a single mom because she doesn't have a job. To protect her baby, she decides to tell her husband that she is pregnant with his child.

There is Domestic violence where Wife saved by another man which leads to romance. Focus of this drama is affair but as its based on abuse so it cn b added.

Yeon Joo is an elite prosecutor who started from the bottom. Although known as the best in corruption investigations for the Supreme Prosecutor’s Office, she suffers amnesia after a car crash when chasing a suspect. As she wakes, she finds herself being Kang Mi Na, the daughter-in-law of the conglomerate Hanju Group. Before her disappearance, Mi Na was a troublemaker born out of wedlock. Now sitting in her position, Yeon Joo is not able to hide her rough and outspoken nature. She then meets Seung Wook, a conglomerate who visits his first love Mi Na to reveal the truth of his father’s death. Will Yeon Joo and Mi Na be able to regain their lost memories in this mystery and succeed in true love?

It only has a common theme of domestic abuse and other controversial topics. To save the victims, the main characters have gone overboard with their measures, for Love in Sadness— medical malpractice while Under your bed— (more) obssessive stalking.

They have different stories and perspectives. In the drama, it is like a third person point of view, while the movie is more first person POV.

Byun Ji Sook, burdened by her father’s debts and relentless loan sharks, dreams of a better life. A twist of fate introduces her to Eun Ha, a wealthy woman who looks just like her. Seizing the chance, Ji Sook assumes Eun Ha’s identity and steps into an elite world, where she meets Min Woo, a wary chaebol heir drawn to her authenticity. But how long can Ji Sook maintain the façade and conceal her true self?

Both dramas have obsessive male leads that show their love in a rather questionable, unhealthy manner. Still they are interesting and complex characters.
Female leads who are hurt and negatively affected by male lead actions.
In My Heart Twinkle Twinkle the male lead is given a chance at redemption.

Though the main genre is quite different both kdramas have romance
> FL is abused by her husband and wants to get divorce but the husband is unwilling
> ML loves FL a lot and tries his best to protect her.
> There is a 2nd FL who is in love with ML

Both deal with woman trying to escape their horrible situations. where they have to get surgery to escape.

Love in Sadness is the remake version of Utsukushii Hito

Both of the female lead have abusive husband and undergone full plastic surgery to
hide from their husband.

Utsukushii Hito's female lead is better because she is more stronger than the
female lead in Love in Sadness

ML holds FL captive, abuses her and is totally obsessed over her. He also threatens to kill himself and does illegal stuff to stop her from leaving. She tries to escape as well.