Missing established itself as a spiritual sequel to Searching, with many connections proving the films exist in the same universe. Both movies were produced by Aneesh Chaganty and Sev Ohanian, who also wrote the script for Searching. The 2018 thriller follows David Kim (John Cho) on a mission to find his missing daughter, Margot Kim (Michelle La.) Missing, which premiered in early 2023, follows a similar plot, except the roles are switched. In the newer film, June Allen (Storm Reid) tries to solve her mother, Grace Allen's (Nia Long) disappearance. The movies share many other similar elements as well.
https://screenrant.com/missing-searching-connections-easter-eggs-missed/