Soredemo, Ikite Yuku (2011)

In both dramas a sibling of one lead killed a sibling of the other lead.
Seredemo, Ikite Yuku plot:
Fukami Hiroki's younger sister was killed by a friend. Hiroki then meets the killer's sister, Toyama Futaba, 15 years after the incident. Both of their families have been burdened with grief, but through their meeting they struggle to find a brighter tomorrow.

Bcz both focused on repentance of the sins .i really wish if there were only 20 words required but i really want PPL to watch this.

The dramas are related to death of a little girl,mother sets out to seek revenge or avenge her child.time gap n repentance.

I think the second lead character is similar to the antagonist of this drama.both were emotionally void n commited crime .

Both are Japanese language dramas that show how family members of a criminal (who might even be wrongfully accused) are ostracized by society.

Both are family dramas with very similar atmospheres though Soredemo tends to lean more into the drama and despair as a result of its much heavier premise. Nevertheless, both tell a gentle and subdued story about love and healing.

Both have ....

-same writer
-Kurashina Kana <3
-some suspense plots
-(very) depressing tone in the start of series, but gradually become more hopeful
-somewhat unique and beautiful ending

If you are after a Soredemo Ikite Yuku style movie with tense situations and masterful acting that will haunt you long after the credits roll, Harmonium is the movie for you. Must watch.

(reccing this as of episode 2 of Doubt airing)
Both feature an arc regarding a child killing a child now grown up, and the mystery of if they are capable of doing so again in adulthood. There is the push and pull of the perpetrator's family wanting to trust believe and understand them, but ultimately not being able to let go of that suspicion.
Both the killers have a stoic and unremorseful personality assisting in the struggle to accept them and their words.

Both shows depict how the family's of the victims and the perpetrators are affected after a murder. In Soredemo, Ikite Yuku its the female lead who is the perpetrators family.

Both are about two families going through the trauma of an incident that splits them apart. And in doing so, they realize they've all been grieving in their own way silently and that closure can be found. Soredemo, Ikite Yuku is significantly darker, while the mood in Welcome to Samdal-ri is more light-hearted.