"Anna" is a common name, so maybe it's a public figure. Then "lk21" – maybe it's a username, a song title, or part of a project. LK could stand for something, like a location, initials, or a term. The number 21 is a bit vague, but combining "LK" and "21", maybe "LK21" is a website, a group, or a code name.
If you are looking for these films, it is recommended to use official platforms to ensure safety and support the creators: All About Anna (2005) all about anna lk21