Be with You (2018)

Jin (Co Ji Sop) has a difficult time: his wife Su A (Son Ye Jin) died, leaving them alone with her son. Before her death, she promised that she would return to them a year later on a rainy day.
A year later, while walking, Wu Jin and her son are greeted by a woman who is positively attracted to Su A. But she does not remember who she is and what she does.
The film is based on Ichikawa Taqiji's "Ima, Ai ni Yukimasu", on which the Japanese film "Be with You" was filmed in 2004.