Recommendations

Both MCs will live parallel lives depending on their choices.
Both FLs have two MLs that she will meet and fall in love with

- Both is a crime-solving drama
- Both genre is mystery
- Both drama about finding a culprit of past case
- Both drama does not make it easy for you to guess the culprit

Differences
- In My Perfect Stranger, mc goes back in past to find the culprit
- In Chimera, mc stays in present but looking for culprit of the past case

Both The Sand Flower and Shiko Funnatta!? are sports drama about wrestling and about a team that is on the verge of disbanding.

Please watch this if you're looking for something to fill that empty void in your heart. This and 25-21. Both of them are not only simmilar to Twinkling Watermelon, but you'll also find the vibes, character dynamics and themes that are recurring.

Seriously, the vibes are so simmilar. And those who can't move on from hee-do and yi-jin, You'll find a happy ending in Twinkling Watermelon.

Sena is a college music graduate who dreams of becoming a professional musician and a world-class pianist. Unfortunately, he has not been able to find any breakthrough opportunities and has to settle for currently teaching piano at a local piano school. Minami is an out-of-work model. On her wedding day, she was dumped by her fiancé, and when she rushed to her fiancé's apartment, she finds out that not only was her fiancé Sena's flatmate but that her fiancé had also skipped town along with all her savings. Rendered penniless, she then moves into Sena's apartment, occupying the empty room that was her former fiancé's. The two down-on-their-luck persons with very different personalities find themselves bonding over their similar situations in life.

Mashiba Kurumi works as a publicist for "el Arco Iris," an interior design company becoming popular with young people on social media. She's a fashionista who cares a lot about her appearance and what others think. She works hard to gain the admiration of her coworkers and boss, Hayama Shogo.

Kurumi is so busy with work she forgets to renew her apartment lease, so her friend Koko helps her find a new place, but it's a share house with three strangers -- Fujino Shun, a minimalist chef who only wants to live a simple life. Then there's Terai Haruto, Shun's cousin who works as an online counselor to help people with their problems. Finally, there's Hase Ayaka, an aspiring artist who makes contemporary art while working part-time as a delivery driver at a high-end supermarket. And so, these people of different ages, occupations, and values come together under one roof. Though their personalities clash, Kurumi falls in love, deepens her friendships, and learns to take off her "armor" and live as herself.

Mashiba Kurumi works as a publicist for "el Arco Iris," an interior design company becoming popular with young people on social media. She's a fashionista who cares a lot about her appearance and what others think. She works hard to gain the admiration of her coworkers and boss, Hayama Shogo.

Kurumi is so busy with work she forgets to renew her apartment lease, so her friend Koko helps her find a new place, but it's a share house with three strangers -- Fujino Shun, a minimalist chef who only wants to live a simple life. Then there's Terai Haruto, Shun's cousin who works as an online counselor to help people with their problems. Finally, there's Hase Ayaka, an aspiring artist who makes contemporary art while working part-time as a delivery driver at a high-end supermarket. And so, these people of different ages, occupations, and values come together under one roof. Though their personalities clash, Kurumi falls in love, deepens her friendships, and learns to take off her "armor" and live as herself.

Both ML are in finance - in SAHPH he is from middle class and he has funny theory of how you can live on small budget
Both ML are not speaking a lot.

When her boyfriend was caught cheating on her, Terada Aki moved out of her apartment and into a sharehouse, where she found herself reunited with her first love, Hongyo Tomoya. Hongyo is novelist, but he has recently been having trouble with his writing, and he asked Terada for help - with a shocking proposal. To complicate matters, the other residents in the sharehouse also start interfering in Terada's life.

A love story between Risa Shiroki and Hiroto Fukami. Twenty year old Risa Shiroki comes to Tokyo from her hometown in the countryside to attend university. Pretty and popular with male students, she has never had a boyfriend and dreams of having a sweet love. One day, thirty year old Hiroto Fukami appears in front of her. He is business man who appears to be gentle and looks perfect. A romance blossoms between them.

Ancient Love Song - travels back in time and interacts with/falls in love with woman who becomes integral to history of the kingdom/becomes Empress. Also affects how things happen.
Splash, Splash, Love - travels back in time and interacts with/falls in love with famous king in Korean history. Also affects how things happen.

Both are short (Splash, Splash Love is shorter), both travel back through a medium - rain puddle/precious stone medallion, both are sweet and poignant.

Both dramas have time travel for a daughter or a son to meet his or her parents in the past
Both dramas are romantic dramas full of youth
Both dramas are very realistic drama for their past time
Both dramas are very heart warming , family drama

In one of the anthology stories of 140 ji no koi, the ML's fictitious self works as a proxy break up service. The unique job choice reminds of the proxy Job Quitting Service in Lost.

SPOILER!!!



In both of these dramas, after a bad fight and breakup, one of the leads gets in an accident resulting in amnesia. This results in persistent amnesia that makes him forget the person he was dating right before the accident, but continues to live in close proximity to them and realizes romantic feelings all over again.