Recommendations

School themed supernatural plots, "Whispering Corridors 3" is the most light from the franchise and is a good match to Nightmare Teacher.

Both are supernatural, mystery, and school themed. With different main plot, but very alike in many other ways.

1.both the female leads are sick
2.both female leads are strong and smart
3. both dramas are going to make you cry but at the same time will even it out with laughter.

Both are about children who witness the cruel death of people they love, and who promise to avenge them once they grow up.

Those two dramas...taste the same, I should say.

In Ouroboros, two childhood friends choose different paths to avenge a loved one: one a path of light, the other a path of darkness. They are compaired to an Ouroboros, two dragons biting each other's tail, symbol of eternity and harmony of light and darkness.

In Orthros no Inu, two men are connected by a mysterious bond: one is a good man cursed with the power to kill by one touch, the other is a criminal blessed with the power to heal with one touch. They are compared to Orthros Dog, a two faced dog, one good, one evil, bound together by destiny.

Both about time travel, school friendship, past regrets and another chance to get back what they lost..
"to make the perfect choices that will alter what seems to be fate?"- Orange

" to learn how to face himself honestly and learn how to love? Cherish the precious things in youth?"-Love, Timeless

“Maybe it's impossible to live life without any regrets. Even when you know the future... you'll still mess up."- Orange

"what if you are younger by 10 years, what would you want to change?" -Love, Timeless

Both are japanese dramas based on josei mangas. The female leads deal with unemployment and the male lead end up hiring them.
It is about adult life, money and relationships. The two of them are funny but also real life situations.

Both are a mix of romance and drama, the romance of this show being separated by time travel (very similar to W's two world separation).

Leads have super powers, both are based at gaming companies. Both have quirky humor. Both have OTT violence. Watch for Lee Dong Wook.

The stories arent really similar but they have the same comic feel

Kora kengo is an acotr in both films. Norwegian wood is more melodramatic than yonosuke which is more slice of life and comic. Both have the same nostalgia around youth and life

Same male lead. Same nostalgic/ aesthetic atmosphere surrounding the characters

Both are about doctors who lernt this profession when thinking of understanding a medical error of the past and who are going to certains hospital when hoping to discover information. Both have romance aspect and difficulty between differents doctors and hospital director. It's seems like there is an interesting but complex plot for surgeons but the 2 dramas looks like they are nearly about the same type of stories. Maybe less about romance for surgeons and with a different type of surgery than in doctors.

Both are about doctors, even if the stories are differents with one being more on political aspect than the others. There is a competition between doctors and hospital's director who have secrets in both, witch is really interesting I think.

Similar plot..in both series the main leads end up living together because of some circumstances ; one of them can't stand the other one; both series start with "a letter of love", both girls are naive when it comes to love, etc.