On July 12, Seo In Guk surprised viewers by showing how buff he was on the latest episode of MBC‘s “I Live Alone.”

On the show, Seo In Guk talked about his upcoming film “No Breathing” and how he was training daily to match the fitness level of his character, who is a swimmer. Seo In Guk also went on to delight some viewers by revealing the results of his hard work by taking his tank off and showcasing his well-defined abdomen, biceps and back. 

Netizens commented, “Wow, Seo In Guk has an amazing body”, “He looks completely different than when he was on ‘Super Star K‘” and “Seo In Guk gets more handsome every day!”

“No Breathing” will also star actors Lee Jong Suk, Ah Young and Girl’s Generation member Yuri