Korean actors and celebrities are achieving mainstream success in Japan--thanks in large part to the success of Korean drama, “Fuyu no Sonata (Winter Sonata)”, which aired on NHK-B2 in April of 2003, quickly becoming a smash hit. The overwhelming popularity of the lead actor known as “Yon-sama” (Bae Yong Joon), resulted in the term “kan-ryu (korean style)” being coined and popularized.
The trend first began among the older generation, but quickly spread to the younger generation with the the steady arrival of new K-Pop artists beginning in 2005, until the “kan-ryu” fever had swept up both old and young alike.
With this new trend, Shin-Okubo district has undergone a drastic transformation within the past three or four years; the backstreets are now as crowded as Takeshita street in Harajuku.
Korean males living in Japan have become as stylish as Japanese in regards to fashion and hairstyles---reaching the point that they've graduated from copying the styles of Japan and Western countries, and are now able to create their own style that takes the best from other countries, yet contains unique elements all its own.
It's little wonder that Japanese women are crazy about them.