- The film is hailed as the Korean version of "Leon", and Won Bin's outstanding performance has also fascinated countless female audiences throughout South Korea.
- The protagonist of the film, Kim Sae ron, didn't even know Won Bin, which was popular all over Asia, before working with him. In addition, outside the play, Kim Sae ron is also called Won Bin "The Man from Nowhere" instead of "Brother".
- "You live for tomorrow, right? But I live for today!" is a classic line in the film, which is what Tae-seok said when he was speaking to the underworld.
- The film hit the box office with more than 6.2 million viewers and was the best-selling Korean film in 2010.
- Won Bin won the first actor award for this film.
- Song Hye Kyo and Yoon Eun Hye appeared in the film premiere to help out. Among them, Qiao Mei and Won Bin collaborated in "Blue Life and Death" in 2000, ten years ago.
- Won Bin conducted 3 months of martial arts training for the special agent's skills before the performance, and significantly reduced his weight.
The Man from Nowhere behind the scenes gags
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Jeong So-mi: Mister? I embarrass you too, right? That's why you ignored me? It's okay. My teacher and all the kids do that too. Mom said that if I get lost, I should forget our address and phone number. She gets drunk and says we should die. Even though that pig called me a bum... you're meaner. But I don't hate you. Because if I do, I won't have anyone I like. Thinking about it hurts me here. So I won't hate you.
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Storekeeper: [to Tae-Sik Cha] Kids will learn from their mistakes. Parenting isn't just giving birth. She's always by herself. Bring her around more often, like the other dads. It's on me.