<P> Kim's popularity skyrocketed when he starred in the hit period drama Moon Embracing the Sun as the young king Lee Hwon . The drama recorded a peak rating of 42.2 percent, thereby earning the "national drama" status . Kim contributed his vocals to the soundtrack with the traditional ballad "Only You" and the more modern composition "Another Way". </P> <P> Due to his popularity on - screen, he landed 15 product endorsement deals ranging from apparel to electronic devices . He also won the Best TV Actor award at the 2012 Baeksang Arts Awards . Beating out heavyweight veterans such as Han Suk - kyu, Shin Ha - kyun and Cha Seung - won, Kim said "I am very grateful for this moment, but I am ashamed as well . It's like getting a lot of homework . I'll keep trying to become a better actor in order to remain worthy of this award". </P> <P> Kim made his big - screen debut in the star - studded heist film The Thieves, touted by the press as the Korean version of Ocean's Eleven . With over 12.9 million ticket sales, the film became the second highest - grossing movie in Korean film history . </P> <P> In 2013, Kim was cast to play the role of a North Korean spy who infiltrated South Korea as a village idiot in the movie Secretly, Greatly, an adaptation of the popular webtoon series Covertness by Hun . The film broke several records and was one of the most successful box office hits of the year . Kim won Best New Actor awards at the 50th Grand Bell Awards and the 50th Baeksang Arts Awards . </P>

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