Both are based from a novel by Fumie Kondo. Judging from the first few episodes of both dramas, they are similar with some details. Aside from the mystery thriller vibe from both, a high school backstory is a common ground. In addition, the female protagonists are both writers. In Influence, Oikawa Tomomi is a novelist while Makabe Suzune is a scriptwriter.

Although they are different in terms of the length and genre, both shows falls in marriage. In Once Again, there are a lot of couples that were divorced but the main couple's cause of their fallout is similar to the main couple in VIP. I highly recommend both!

From the first episode of The Penthouse alone, I can already make parallels. Rich families living in an exclusive property, two students who are competing for one goal, a highly-esteemed teacher, and so on.

Kaguya, Miyuki and Reiko won't stand being the one who confesses their feelings to their love ones. Kaguya and Reiko are both rich heroines who are doing extreme measures to be with their crush. Reiko is not that subtle compared to Kaguya, though. I love Love is War better because Miyuki is as prideful as the female lead, it simply makes it better.

It only has a common theme of domestic abuse and other controversial topics. To save the victims, the main characters have gone overboard with their measures, for Love in Sadness— medical malpractice while Under your bed— (more) obssessive stalking.

They have different stories and perspectives. In the drama, it is like a third person point of view, while the movie is more first person POV.

Aside from having Nagano Mei in both, Makoto (Ryo Ryusei) reminds me of Teiichi (Suda Masaki) as a student leader while Matsubara reminds me of Dan (Takeuchi Ryoma).

They have different plots but the student leadership of the characters I mentioned were just similar, in my opinion.

These both have a 'serial killer' living like normal innocent people. The basement is too familiar to me when I watched Flower of Evil.

Both have that whodunit story that will make you distrust (or at least be suspicious of) every character. Although they have a different plot, you'll feel the same frustration of not knowing but you would still want the journey of how things will play out.

Teiichi is comparable to Kaguya as both are elites who are proud, competitive and strategic in their plans. The difference lies in their motive. While Teiichi is vying for the position of becoming president, Kaguya, is ploying to make the President confess to her. They are also unintentionally funny, and that's one of the reasons why I like these two movies so much.

Note: If you haven't seen the anime of Kaguya-sama: Love is War, it is definitely better since it is longer (it already has 2 seasons). But of course, I still appreciate the live action.

Both dramas need to be watched privately for the sole reason that it will make you crack and ugly snort if you watch it in public. They have different premise but they have the similar elements of friendship, life, and (very little) romance.

Waikiki is more like a sitcom, but I love the development of the characters. For Prison Playbook, it feels more like a more organized drama where you get know each inmate and their story with comedic elements in it.

The story of both movies was prompted by a psychopathic teacher who orchestrated the death of his students.

Both movies involved a survival game which only one must survive.

Also it had a shared setting-- the school. Moral lesson, do not go to school. JK. Just be prepared before going. A lot of things may happen.