Kimi wa Petto (2003)

They both involve "forbidden"/"frowned-upon" relationships.
And Matsumoto Jun does a GREAT job in both dramas!! I highly recommend if you're a MatsuJun fan!

Unusual love stories where boys have atypical roles (Dinosaurs maniac / Pet). Their actions and behaviours are weird, but kinda cute.

Shinichi debuted as a novelist at a young age, but his career has been stagnant for many years. He also has broken up with his girlfriend. His day have now become gloomy. At this time, Yuko and her son moves into Shinichi's home. Yuko is the ex-wife of Shinichi's friend. Shinichi lets them stay at his house. Shinichi writes his novel every night, while Yuko goes out at night to date men. She is conflicted with her feelings to act as a strong parent and to deal with her unspeakable loneliness. Yuko’s son, feeling the loss of his father's presence, begins to admire Shinichi. With their living arrangement, Shinichi and Yuko try keep their distance from each other. But one night..

In both series the man is much younger than the woman and while the relationship starts as too people that make a sort of contract, they end up getting close to each other.

One is fantasy and the other not, but both are about the lonely FL discovering the ML who is injured, taking him home with her, and keeping him as her pet.

Both dramas are about a career woman...known to be tough & cold...is lost between the Sunbae she loved for a long time & the younger man who comes to live with her...Who will she choose in the end?

Uma designer gráfica de vinte e poucos anos, Sol Ah sonha em se tornar uma autora de quadrinhos baseada na web e sempre teve uma relação de amor e ódio com gatos. Mas a vida de Sol Ah muda rápido quando ela traz para casa um felino amigável. Acontece, porém, que este não é um gato qualquer. Chamado Hong Jo, ele pode assumir a forma humana. Hong Jo adora Sol Ah e faz de tudo para esconder sua identidade humana dela. Ele logo prova que fará tudo o que for necessário para ficar perto dela. Será que Hong Jo conseguirá manter sua identidade em segredo? E o que poderia estar reservado para esta dupla notável felino-humano conforme seu relacionamento se aprofunda? (Fonte: Viki) ~~ Adaptado da série webtoon "Welcome" escrita por Go A Ra.

Hazuki, working for stationary manufacturer for a year, dates Satoru, held back at university. Things hasnt been going well between Hazuki and Satoru, and Hazuki starts dating Yasuda whom she met at the matchmaking party. On a Valentines day, Hazuki hands a chocolate to Yasuda which meant that he was her most favorite. In return, Yasuda gave her ear rings on a White day. But after receiving a present from Yasuda, Hazuki realizes something very important. When she opened her post after coming back from a date, there was a present from Satoru

The main similarity is the on/off mode of our main character and their need to hide their insecurities and personality traits they think that contrast their "perfect" image(if you ask me everyone shows a different face depending on where they are anyway) . Another similarity is the sweet/demanding persona of the mls. Also both drama have a younger man/older woman romance.

I recommend this both drama because , Male lead and Female lead
try to solve problem
In one drama explosion and another student murder/suicide

Both are about a hard working woman that finds a boy in weird circumstances, takes him in and treats him as a pet, but due time becomes addicted to him and sees him as a man.

Shitara, a man who fell from his elite life overnight. His new "place of employment", which has lost his job, house, and wife, is a boarding house?! Under one roof, a perverted love begins from the worst encounter with one of those living there!

Both female protagonists of this drama are older than their male lovers. In both dramas there are scenes of coexistence between the protagonists.

Both drama deal with age difference in relationships (older woman-younger man) and the topic of whether one should conform to society's expectations or not. Strong 2nd lead presence too.

Both deal with a Ms Perfect learning to drop her guard and fall in love with someone they didn't intend on loving!