In December 2018, Jun teased a video post on Instagram as Sarah was doing a look test with a golden retriever.
On August 31, Viva Films shared the teaser trailer for the movie. Instead of a golden retriever, Sarah is seen with a Jack Russel Terrier, and the video opens with Sarah getting lost with her dog. The next scene shows Regine Velasquez as one of her employees walks out on her. Seeing how stressed she is, Sarah and her dog named Happy step in to save the day. Viewers are then given a gist of the story: Sarah’s character needs to travel to Baguio with Happy to visit her sick grandmother.
The movie has long been in the works. In May 2019, Jun shared a shot of the movie’s script:
In July 2019, Jun shared another photo of Sarah and Regine as they began filming the movie:
Unforgettable is Sarah’s first film since Miss Granny which was released in 2018.
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