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Park Seo-joon made his official acting debut in 2010, appearing in the music video "I Remember" by Bang Yong-guk. He gained wider recognition for his roles in the television dramas "Dream High 2" (2012), "Witch's Romance" (2014), "She Was Pretty" (2015), "Fight for My Way" (2017), "What's Wrong with Secretary Kim" (2018), and "Itaewon Class" (2020), as well as the films "The Beauty Inside" (2015) and "Midnight Runners" (2017).