This article is from the Anime FAQ, by Steve Pearl with numerous contributions by others.
The first animated KOR ever made was an OVA based on a story from volume 5 of the manga with a beach resort being used instead of a skiing resort. For the KOR TV series that followed, the animation company and character designer were retained, but the voice actors were changed.
In episode #46 of the TV series ("Okinawa Vacation"), the same story was used as for the first OVA, but the setting was changed back to a skiing resort.
Most people consider KOR OVA #1 to be "White Lovers".