WHO’S THAT GIRL?: The one in a white could-be wedding dress posing for a picture with every product on display at Tod’s? Song Yun Ah, South Korea’s number one actress, says Tod’s — catch her in the South Korean drama “On Air” — and apparent handbag and shoe enthusiast. Never heard of her? She’s very big in South Korea and Japan, if she says so herself, at least with the help of her translator. And tonight, she’ll be introduced to a more international audience at the Tod’s dinner.