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Seo In Guk first debuted as a singer in 2009 by winning 1st place on the very first season of 'Superstar K'. He then debuted as an actor through KBS drama 'Love Rain' in 2011, officially becoming a singer/actor. 

About his debut acting production, he said, "When I debuted as a singer, I experienced a lot of hardships, but I held it in without telling anyone. That's when I did 'Love Rain', and even from my perspective, my acting was bad."

He also talked about '38 Police Squad', for which he received great feedback. He shared, "It was luck that I met '38 Police Squad' and director Han Dong Hwa. I wasn't portraying the kind of acting style I was aiming for effectively, but all that became shattered by meeting one director. The role of Yang Jung Do in '38 Police Squad' was a turning point for me." 

When asked to choose between his singing and acting career, Seo In Guk replied, "I get asked that a lot, but they're both careers that I love, and it's difficult for me to gravitate toward one more than the other. Even when I'm acting, I carry my computer around and work on music." He added, "I want to become an actor whose productions will get people to say, there are lives like that, when they watch me, and I want to become a singer who can tell people's stories."