Both couples are very sweet and devoted to one another.
Although there is a guy who likes the female lead- he always stays back and doesn't bother the couple's romantic relationships.

A lot of the scenes are around medical cases and inside a hospital.

The guy is a little cold with the girl at the beginning.. but warms up quite fast.

Both dramas have unusual bromances between a very young-looking uncle and his nephew.

Both involve the life of a person.... Born to be neither a male..nor a female.. or maybe both?! He/she is the main protagonist in it.

Both dramas are with a male lead, starring Takezai Teranisuke, and have love stories about couples with big age gap.
In them the couple's connection seems like a whim at first and we slowly watch them fall in love after their first meeting (we witness the love growing) and both leads trying to communicate their inner feelings.

Both are BL dramas, which main story involve two people who knew each other since childhood and fell in love later in their lives (while growing up).

The female protagonist likes to work non-stop and fall in love with the only person who was ones her equal at ones.. the male protagonists who is gorgeous..although atleast 10 years older than her.
She is also being followed by one younger guy.. but it's expressed that her feelings are towards the elder person.
Both women make strange facial expressions .. or have the lack of it.

In both the male protagonist likes to cook nice dishes for especially one person... the female protagonists.

In both they share school life/work life together.

Difference in both dramas is the age.. as in one of them they are high-schoolers.
Love starts to blossom between them.. because of his dishes.

In both dramas a skilled make cook impresses a customer with a different dish he creates by the customer's specific demand or liking.

In Donburi linchou it's mostly the same customer... Also DL is about high-schoolers (same with cook), while Shinya shokudou has many different customers (even if some are regulars) and they are mostly adults together with the cook.

In both we observe the cook preparing the dish.. and the client eating it.

In both a young guy who is about to /or already in charge of/ a company is in need of a bodyguard.
The female lead looses her first love interest in the first few episodes and is in desperate need of a job..
She is appointed as his bodyguard.
They start to feel attracted one towards another..

The dramas involve the company politics of the guy's company together with the problems the female and her "sisters" ("and brothers") have to face in order to salvage the place they are training in.. and to have a position in that place.

Both dramas revolve around a female bodyguard, training other sports like box and her rich male employer who fall in love.

Both are Thai BL romance dramas loosely focused on food and desert-preparing.
Atleast one of the male protagonists have a deep childhood-trauma that impaired his life and is connected with his motherly figure. One of the protagonists is painfully shy.
The gay guys have a female friend that can be and wants to be of help to them.

In both a very self-absorbed male protagonist encounter a very strange/magical event just before the age of 30. Then she has to-rethink and re-evaluate his thinking about himself and everyone around him.
Both are office dramas.
In then the self-absorbed person is surrounded by a cute junior who can't read well his surroundings... .and a senior who indulges him with work..and then surprises him with a lot of understanding.
His partner is a very capable person in his/her work and has a very beautiful face and understanding and gentle nature.
When they talk things out.. both couples are full with cuteness.

Both dramas are company-related.
A new person arrives. It's a female worker with robot-like manners.
She is then chased by two people within the same company (or atleast that's what looks like). One elder one.. and one younger.