 If you liked
Fuyu no Sonata
|
 ...then you might like
White Album
|
Both dealing with relationship problems and twists between the main characters in realistic setting. Winter Sonata has somewhat less realistic plot at some points and focuses on more mature people - in their late twenties or even thirties, rather than college/university students in White Album. Winter Sonata less "harem" and more oriented into women than men but anyway it is worth to see if you liked White Album.