The Swedish movie with "Baby Shark", Selma & Johanna : - en roadmovie,
was put in several children's movie festivals internationally.

In 1997 in Frankfurt, Germany it won People's Choice and Honorable
Mention at the Lucas-Festival.

1998 in won People's Choice in Montreal, Canada and Peoples Choice
in Seoul, South Korea (at the MoMo film festival).

With the film being played at children's film festivals in Germany
and Korea and popular at those festivals, this would help explain
why those two countries picked up the "Baby Shark" song.


Info above retrived from https://www.svenskfilmdatabas.se/en/item/?type=film&itemid=25562