Twinsters - Wikipedia
Found (2021 film) - Wikipedia
How to Train Your Dragon 2 - Wikipedia
Not technically about adoption, but MC is reunited with his mother who he thought had died. Reunification themes
Kung Fu Panda 2 - Wikipedia
Three Identical Strangers - Wikipedia
Elf (film) - Wikipedia
While not technically a transracial adoption, being adopted into a family dynamic where there is no way to hide the fact that he is adopted creates some similarities
Ali & Ratu Ratu Queens - Wikipedia
Not technically about adoption - but the MC is on a journey to seek his birth mother. Lots of abandonment and rejection themes
Return to Seoul - Wikipedia