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The actor is in fact close acquaintances with writer Kim Eun Sook, who is the writer for 'Goblin' as well as several of Kim Woo Bin's past productions like 'A Gentleman's Dignity' and 'Heirs'. He said he keeps in touch with Kim Eun Sook and also that he was "very thankful. We worked together on productions where I was able to let the name Kim Woo Bin be known. She's like a savior to me. I don't know if there's a way to, but if possible, I want to repay her." 

When asked about his name being used in 'Goblin', Kim Woo Bin answered, "I was totally surprised. I texted her immediately. Wow, it was real entertaining. But then my name even came out on it. (laughter). I texted her, 'Fighting!' at my name being used, I said, 'Writer Kim, thank you so much,' and she said, 'I'll buy you a meal with your name's worth.'" 

It looks like the writer may have decided to use Kim Woo Bin's name thanks to their close relationship! Are you tuning in to tvN's 'Goblin'?