South Korea's Supreme Court has rejected a copyright claim against the popular children's song 'Baby Shark.' The court ruled that the distinctive 'doo doo doo doo doo doo' hook did not constitute plagiarism. The case highlights the complexities of copyright law in the context of simple musical phrases and the extent to which existing melodies can be freely adapted. The ruling allows the current version of 'Baby Shark' to continue its widespread use without legal impediment.