Han Hyo Joo just selected as the most efficient celebrity for commercial based on research conducted by star marketing company Onstar (www.onstar.com).
The research was committed to the marketing staff of several companies during July 2010.

Onstar director said  “This result from marketing staffs may coincide with public favorite . Han Hyo Joo is famous with her appearance which can give public a kind and generous image. This image appeals to public as sincerity and straightness. This arouses buying intention.”

Shin Min Ah, Han Ye Seul and Kim Ah Jong followed behind Han Hyo Joo.

Source : asiae