Just as the above user states - a unique and visually stunning animation piece from Korea! Highly recommended!
Namoo, a young boy living with his mother and grandmother, explores an old lighthouse with his friend Junho and his cat, Yeo. They discover a mysterious marble which transports them to a rich and vibrant fantasy world.
Unavailable outside of Korea? - Well, I recently (May 2004) imported the Region 3 DVD to the UK from Hong Kong for a very low price. Beautiful cover - that's what initially grabbed my attention! I'm certainly glad it did! My copy's entitled "Love Fantasy* My Beautiful Girl, Mari". Seek it out!