Promise Cinderella (2021)

The main female lead has struggled with money and thus ends up living with the main male lead. She is in debted to ML. < both dramas share it

Living together and falling in love is also present. In Promise Cinderella there's a love triangle.

A love story unfolds about 7 people, including Kume Masakazu. They are in their 30's, live in Tokyo, and have their own views on love and friendship. Kume Masakazu is single and 33-years-old. He works as a struggling screenwriter. He doesn't have a girlfriend, because he has decided to cut off contact with a woman after meeting them 3 times. Because of his tendency to run away from love, his friends call him the "Man Without Love."

Both MLs are the second sons of a very rich family and the FLs are poor and end up being forced to live in the same house as the ML. Both couples face a personal obstacle to their relationship beyond their difference in social status (age gap vs. family disapproval).

The Ml is high schooler 17 and Fl is 27
Both Male leads are nice
The Female lead is not teacher but in some way is as he fixes the rich brat kid Male lead.
The second Male lead is very capable.

Both male leads are heirs to a traditional business that involves wearing traditional style of clothing. Both have a psycho female character pulling the strings. Both female leads have to navigate working the ins and outs of the business. Promise Cinderella is more of a romantic comedy while Watashitachi wa Douka Shiteiru is a little bit more of darker revenge.

ML is a bully who undergoes character growth and change after meeting FL who he initially plays games with and bullies, but then slowly falls in love with her. ML is a student in both, but the FL is older in Promise Cinderella.

ML is a bully who undergoes character growth and change after meeting FL who he initially plays games with and bullies, but then slowly falls in love with her. ML is a student in both, but the FL is older in Promise Cinderella. Similar style of humor in the lighter scenes.

Nods to the fairytale, poor FL ends up living with rich guy(s) and falls in love with him/one of them. Similar tone and feel.

both the fls are homeless and end up living with the ml who is rich. they’re also both similar in the sense that the fl is older (in atashi no danshi she acts like a mother to some of the boys she lives with) and she earns their respect in the end

Maria, struggling financially, juggles a low-paying day job with nighttime shifts at a cabaret to fund her sister Nana's eye operation. Tragedy struck their family when a young Maria accidentally caused a fire, resulting in Nana's blindness and their father's death. Shiro, a discontented concert pianist, crosses paths with Maria in a traffic accident, leading to his hospitalization. Adopting a false identity and amnesia, Shiro seeks refuge at Maria's home, eventually becoming a cabaret pianist. Unbeknownst to them, fate weaves a complex web, revealing that their lives were never meant to intersect.

Murai is an introverted young high school student with a look that nobody notices. Long hair, curved gait, he is not really what one could call a beauty canon, nor even a person you want to dwell on... He shyly confesses to the girl he loves, the beautiful and sparkling Tanaka, an inveterate otaku who only has eyes for the characters in her games. However, she simply declines his feelings...

The next morning, Murai comes back to school transformed from head to toe. He has dyed and cut his hair and now wears the style of Tanaka's favourite character! Murai will do everything to seduce her and attract her attention!