A Man (2022) on Netflix

Akira works as a lawyer. One day, he meets with his former client Rie, who asks Akira to perform a background check on her late husband Daisuke.

Kido receives a strange request from his former client, Rie, to conduct a background check on Rie's deceased husband, Daisuke. After going through her divorce, Rie returned to her hometown with her child, and eventually remarried "Daisuke" whom she met. She was building a happy family with her newly born child, but one day her husband suddenly lost his life in an unforeseen accident. In the midst of his sorrow, on the day of Daisuke's memorial service, Daisuke's older brother, Kyoichi, who had been estranged for many years, visits him.