Ko Ah Sung plays Seo Bom in the drama "Heard It Through The Grapevine." Because Seo Bom comes from a poor family she surprises her wealthy in-laws with her mastery of English. When her character had to read the pages of a difficult English book, her command of the language also surprised many k-drama fans.

The 23-year-old actress does have a gift for languages but she perfected her English when she played Song Kang Ho's daughter in the Bong Joon Ho film "Snowpiercer."

The film had an international cast with many English-speaking characters. Playing Yona, a girl who grew up hearing many different languages spoken, she said she had to tailor her English in that film.

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