Hospital setting. Male leads are trying to treat female leads' medical conditions. Past romantic relationship between the leads in both.

Sociopaths in love.
Murder, manipulation, naiveness, betrayal...
The ladies prevail!

Both shows weren't very well received but I personally think there's something so intriguing about just watching bad people be bad.

Questionable female leads, naive male leads.
In Genya's case, the female lead is the source of a lot of crime and killings, whereas in Ice World, the female lead is framed into looking just as bad. There are over-passionate cops trying to take down the FLs in both as well.

Leads communicate through online messages, don't meet in person until the end of the movies. Lies are told throughout both.
I personally liked Haru much more than Contact. It gives a better sense of feelings and relationship than Contact does (IMO).

Leads interact through messages (letters/emails) rather than meeting in person for the majority of these films. Female leads both navigate feelings for other in-person relationships while contacting male leads.

Former classmates reunite in adulthood. Bickering dynamic, begrudging-ish path to romance.
Female leads have gone through tough times and have also suffered the loss of parent(s).

Both feature blind women falling for scarred criminal-type men that lie about who they are. The guys both end up in prison while trying to help the girls.

Both star Ishihara Satomi and Aoki Munetaka. They play a married couple in Missing, and bickering coworkers in Pretty Proofreader. Their chemistry in both is great. If Missing gets you down, start PPR to chear you up.

Leads who knew eachother as kids reunite in a school setting. Female leads are both gym teachers and male leads are both rich businessmen. Bickering dynamic between them continues from childhood into adulthood all as romance ensues.

Both are about the female leads getting sucked into a novel they're disappointed with. LGIEF's FL is writing negative comments when she enters, and TSS's FL is writing fanfic to fix the issues she has when she enters. They go along with the story and develop a goofy/banter filled relationship with the second ML of the novels, which later develops into romance. MLs are also both the 'secret' author of the novels in both.

Both of these series have very complex and intelligent writing in terms of framing suspicion. They'll have the viewer convinced of who the killer is based on what they've plainly laid out for us, only to then shock us and turn us on a new path towards someone else- again and again.

Both feature a love story between a blind woman and man who is a gangster/criminal with a scarred face.