Igor, better known as "Ozbiljne Teme", is the most successful creator of educational content in the Balkans and one of the most popular YouTubers among school children. His content is consumed in schools and regularly trends on YouTube. Over 500k followers on his networks can't wait to learn something new in the field of history and geography - what's more, they thank him for passing their exams because of his content, which is both informative and entertaining. Igor is known for his special style of humor, attitude and until recently, his styling - russian cap and sunglasses.He has successfully collaborated with A1, ASUS, Banini, Surfshark, Wargaming and Wolt.