Im Siwan Transforms into Indomitable Marathoner Seo Yunbok with 6% Body Fat

Actor Im Si-wan returns as marathoner Seo Yun-bok.

Im Si-wan stars as Seo Yun-bok, the national representative at the 1947 Boston Marathon and a runner dreaming of becoming the second Son Ki-jung, in the upcoming film '1947 Boston' (directed by Kang Je-gyu), set to be released next month.

'1947 Boston' stills [Photo by Lotte Entertainment]

The film depicts the inspiring journey of marathoners challenging themselves to compete internationally for the first time after Korea's liberation in 1947, proudly wearing the Taegeuk mark, and will premiere in theaters on September 27 during the Chuseok holiday season.

Im Si-wan plays Seo Yun-bok, an indomitable marathoner who, despite coming from a difficult family background and never having formally learned to run, sweeps through various competitions with grit and determination. He underwent intensive training, consistently participating in marathon events.

To accurately portray the strong and sturdy physique of a marathoner, he followed a strict diet regimen, reducing his body fat to the 6% range, maximizing his resemblance to the real-life figure. Even after filming concluded, he continued practicing marathon running in his spare time and participated in a 10km marathon race, achieving excellent results, demonstrating his unwavering passion.

Director Kang Je-gyu praised, “On the first day of shooting, the moment I saw Im Si-wan on screen, I got goosebumps. He is an actor who gives the director a thrilling and exhilarating experience.”

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