Saver(2002)

Saver

Lena Ha is a beautiful and tough girl who is the captain of Kendo team. She meets Hye-Min Kang, the son of the president of a big company in Korea, and the two seem to feel love at first sight. But when Lena learns that she and Hye-Min are half-siblings, she runs away and falls into a strange body of water. When Lena comes to, she finds herself in a strange kingdom...and learns that she may be its only hope.

(Source: Tokyopop)