Jun Ji-hyun (born Wang Ji-hyun on 30 October 1981), also known by her English name Gianna Jun, is a South Korean actress and model.

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 She rose to fame for her role as The Girl in the romantic comedy My Sassy Girl (2001), one of the highest-grossing Korean comedies of all time. 
Other notable films include Il Mare (2000), Wind struck (2004), The Thieves (2012), The Berlin File (2013) and Assassination (2015).
Jun has also starred in television series My Love from the Star (2013–2014) and Legend of the Blue Sea (2016–2017).
The success of her films and television dramas internationally established her as a top Hallyu star.
Actress Jun Ji Hyun revealed the secret of her enduring elegance and slender physique.

The 39-year-old actress, Jun Ji Hyun, shared the secret to keeping her slender physique in W Korea magazine.

Jun Ji Hyun  "Just as we take breath for granted, I exercise like something as important as breathing."