Recommendations

The main Male lead played as a support role as an doctor with an dark past. Check out Fu Yao. its defintely worth your time!

Similar in the sense that 2 hardcore women who are into righting the wrong except gokusen is reforming gangsters and whatnot whereas saito san is reforming society

Both female leads are smart and strong and well genius
The male leads are both also smart
And if it counts both the female leads are by the same actress.

Similarities:
- Female centered plot.
- Strong, smart and independent female leads.
- FLs striving to accomplish their goals.
- Lots of sismance and comedy.
- Brilliant production.
- Characters are amazingly written and produced.
- Keeps you hooked from the first episode.

Both feature male nine-tailed foxes who ended up falling in love with humans and wanting to become humans. Both also featured nine-tailed foxes that became evil spirits due to an unfortunate circumstances in the past.

While the two shows dealt with different kinds of supernatural creatures aka gumiho and grim reapers, there's still a point of similarity between the two which was the Korean mythology involving the afterlife/underworld.

It’s a little different, 4 kinds of House is about people who end up living together. But, it has the same kind of general appeal. The dramas are short and the story is faster paced. And of course, it has some romance! I’d definitely recommend

In this too both leads has the ability to foreseen the future....plus the female lead in this drama also has foreseen her death

Yuzuru asked Touji out as a half-hearted joke, not expecting to be taken seriously. Touji accepted, and Yuzuru knew he was like the rest, relationship began on a Monday, and dumped on a Sunday. What he did not expect were the feelings that went beyond friendship that emerged. It's now Friday, and the end is approaching. But is it? Yuzuru may be mourning the inevitable, but what about Touji? Friday begins the end, but Sunday reveals all.
Both are BL with handsome leads
Adapted from Manga
Both have happy ending.

Bright and early one monday morning, Shino Yuzuru asks Seryou Touji out on a lark when they run into each other at the school gate. Seryou, who's immensely popular, has the odd habit of going out with anyone who asks him out first at the beginning of the week, then promptly dumping them at the end of it. "Anyone" apparently includes male upperclassmen like Shino, and as a boyfriend, Seryou is perfect, unfailingly thoughtful and kind. Shino, obviously, has no intention of being in a serious relationship with Seryou

Both are BL
Both are Adapted from manga
Both have handsome leads

They both have beautifully written characters who break out of the standard tropes. The things they go through and the way they react in both shows make for unique stories.

(and also Seven Days: Friday-Sunday which is part 2)

both are about boys finding romantic feelings for each other and both have a fairly chill and light-hearted vibe about it. They also both have a sort of similar ending where there is a separation through a misunderstanding and then a reconnection.

One is Korean and one is Japanese though, so up to you if that bothers you.

Both ML and FL has crush on each other since childhood. But they didn’t tell. After entering university, they confess to each other that they loved them from long ago.

Both have female leads that are undercover as males. Both female leads don't really look like guys and both end up making the guy fall in love with them. Also I'm pretty sure some of the filming locations were the same like the fields and the waterfalls.

The two will keep you on the edge of your seat until the very end. They are both about investigation and finding the truth while everyone is lying to protect their interest. In both there is the aspect of brotherly love that goes beyond everything. There is also the aspect of mental health due to chilhood difficulties in both. And in the end, they will both blew your mind away.