Recommendations

Both include time travel and a sweet romance. Splash splash love is a movie while someday or one day is a drama.

The ML fallen deeply in love with FL almost love at first sight and did incredibly silly things to win her heart.

Typical crazy funny romcom J drama that you will laugh incessantly because it was unrealistic and manga like.

The main actors are visually not bad but most importantly the ML and FL are natural comedy actors and not trying too hard to play a romcom.

The same Friends to lovers trope but a more mature story. It is only a special so it never drags.
Short and sweet

Both involve ghost-seeing leads assigned to work with the underworld to maintain order. Ferryman has 3 seasons + a movie.

The plot of both movies are nothing alike, but both movies gave me that mindfucked effect which is really quite unpleasant but does not take away the enjoyment from the story. Enjoy!

Both have supernatural elements and ancient male leads. as well as lots of humor to balance out the dark parts.

While watching Someday or One Day I kept thinking of the similarities it has with the movie Tomorrow I Will Date With Yesterday's You. In the movie, the two main leads are on two different time lines, the guy moves normally through time while the girl's time moves in the opposite direction. The movie doesn't include time travel like Someday or One Day but there I still felt a similar vibe when the adult versions of themselves meet the child version of their partner, which occurs in both shows. Also, the pain is real in both the movie and the drama, ow my heart.

It has the same main-leads.

Both are romantic dramas.

In both dramas the main-lead sexually assault the female lead.In "Dao Pra Sook" he literally rapes her.

It can also be recommended for the 2008 version of Sawan Biang.This version also has the same female lead as "Duang Jai Patiharn"

Both are slap-kiss and has forced kisses.

Both have mean male-leads who always snaps and shouts.

Both heroines are head-strong and stubborn.

Both films have a charmingly awkward female lead reminiscing on her high school days and a romance that blossoms after a run-in with the male lead. The stories are similarly framed, with several plot points overlapping, but unique enough that you can enjoy both without feeling like you're watching the exact same film.

Both the film and the drama deal with the trauma that happens to someone once they have been caught in a building collapse. One is a natural disaster, while the other is a human one. If you liked the healing nature of this drama, you will love the film.

Inochi shares the same narrator, music composer and screenwriter as Oshin. While Oshin portrays the life of a poor sharecropper's daughter, Inochi does the opposite by portraying the life of a rich landlord's daughter. Both women, however, are to face a great deal of adversity and hardship.

While the two series weren't quite similar aside from the common crime/investigation genre, there was at least one common trait. As in, the fact that both dramas featured Nishikido Ryo as an eccentric forensic officer/expert. And for people who're a fan of the actor, it'll be interesting to see how Ryo's character differed in Joker as compared to Trace.

With The Untamed you have a Chinese drama that manages to turn subtextual bromance into an art form.

Oldboy and No Mercy has many similarities. To list a few major ones are Story is similar, Revenge is also similar. And finally at the climax a huge twist appears which makes the movie to the top level.