[KMS] The First Battle with the Black Mage (Orchid & Lotus)

Pink bean might indeed be the one you think about. It might have not taken a year but it definitely took more than half of one to defeat it. I remember because many servers, mainly scania and windia were rushing to see who killed it first and both sides would constantly upload videos of their progress.

Now that I think about it, it wasn't beat in GMS for nearly a year but it was beat much sooner in China after they increased the time limit.