Hyde, Jekyll, Me

both leading actress in this dramas fall in love with a D.I.D..
you can see/watch how they struggle their romance and how the D.I.D/ leading actor overcome his sickness..
this dramas are quite teary so prepare tissues.. (hmmmm.... I guess for me..coz I cry easily!?..)
all in all this dramas are good..

In both dramas :
- Dissociative Identity Disorder
- Double Identity
- Psychological Romance
are common

Both have 2 personalties. With the other personality a sweet, kind, gentle person and the original personality a cold, ruthless person. But on SHNPT there is reincarnation, supernatural elements added.
Both have a previous connection with the FL with the other (sweet) personality. They both also have the second personality getting closer to the female lead and them bonding while the original personality does not like the FL at first. There's also cohabitation between the ML and FL due to FL safety.
All in all, I feel, that HKM is a much simpler remake of SHNPT with some plot changes according to their culture and audience preference.

ON Song Huajai Nee Puea Tur

A businessman loses his memory and becomes someone who is the complete opposite of his former self and only remembers a woman and someone who looks like her, this involves past life memories

ON HJM Main lead has got dissociative identity disorder, he is also a chaebol, Main lady who's trying to save his circus in the theme park finds herself falling for both of personalities of the the main lead.

The main character has a split personality which happens in both show. Also, the main guy is both oozing out with charisma.

Both dramas shows a lead who suffers from double personality disorder. In HJM is the male lead, on meloholic is the FL. Also there is a criminal aspect on both dramas.
I enjoyed meloholic more because has more comedy with a lead who supports the one who suffers from DID. In HJM I hate the FL for being selfish.

In both dramas the main lead has Dissociative identity disorder (DID), where the two different personalities have different love interests.
Hyde, Jekyll, Me has more comedy while Dear Hyeri is more melodrama.

both of them have similar story of double Identy or Twins hhmmmm amazing soundtracks, nice actors, a lot of misterous to solve

Both dramas involve the male lead with DID. The difference is that the two identities are played by two different actors in Bad and Crazy, which is quite unique and makes the story interesting.

there are both about an amusement park. the male lead wants to tear it down and the female lead wants to save it. slowly but surely the cold-hearted businessman (male lead) warms up to the cheerful but naive girl (female lead) and eventually they fall in love.

Gu Seo Jin is a third-generation chaebol who runs the theme park Wonder Land. He seemingly has everything — looks, brains, and fortune. But a traumatic incident in his childhood resulted in Seo Jin having a split personality — one is a cold, ruthless man, while the other is the polar opposite, someone kind and gentle. Because of this, he vows never to date or marry. Seo Jin wants to get rid of the circus show at Wonder Land due to low ticket sales and high overhead costs, but he butts heads with circus master Jang Ha Na. Ha Na insists on saving the failing circus and dreams of revamping it back to its former glory. She soon finds herself falling for both of Seo Jin's personalities.

Adapted from the webtoon "Dr. Jekyll is Mr. Hyde by Lee Chung Ho

basically the storyline is the same. Dual Personality, memory lost regarding some accident etc

Iwai Takumi, a third-year university student, was a fan of Katagiri Mio, also known as MIO, from the idol group AMEL. Her smile was a source of daily support. However, he was shocked to learn of her relationship with the popular musician Kaito.

While visiting his late grandfather's house in the countryside to heal his emotional wounds, Takumi happened to come across Mio, who was aimless, rain-soaked, and covered in wounds. Mio begged him to let her stay for a while, and he accepted her, beginning the life of his dream of living with his idol. As they spent time together, Takumi realized that Mio had another personality, Maki. Then, news broke that Kaito, who had been in a relationship with Mio, had died, and he began to suspect that she might be the murderer. He wanted to believe, but he couldn't help but doubt. And so, Takumi took action out of love: to protect his "beloved idol" and become an accomplice.

This is a dangerous and heartbreaking love suspense story about a man who becomes addicted to "illusory love" and falls into depravity.

University student, Takatsuki Minato, likes things to be clean and in order while her stepbrother, Takatsuki Toru, is a bit of a player. One day, while cosplaying as a high-school student in a fashionable district in Tokyo, Minato accidentally bumps into Toru and quickly lies about her identity. To her surprise, Toru appears to take an interest in her alternate identity, Mina, and asks her out. Thinking that she might be able to cure Toru out of his playboy ways, Minato continues to disguise herself as Mina but will she be able to keep up the charade when she starts developing feelings for Toru?

Gu Seo Jin is a third-generation chaebol who runs the theme park Wonder Land. He seemingly has everything — looks, brains, and fortune. But a traumatic incident in his childhood resulted in Seo Jin having a split personality — one is a cold, ruthless man, while the other is the polar opposite, someone kind and gentle. Because of this, he vows never to date or marry. Seo Jin wants to get rid of the circus show at Wonder Land due to low ticket sales and high overhead costs, but he butts heads with circus master Jang Ha Na. Ha Na insists on saving the failing circus and dreams of revamping it back to its former glory. She soon finds herself falling for both of Seo Jin's personalities.

~~ Adapted from the webtoon "Dr. Jekyll is Mr. Hyde" by Lee Chung Ho.