Tunnel

The Fountain Pen (1x15)

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Kwang Ho finds out that Yeon Ho had been kidnapped by Mok Jin Woo and goes after him with the whole team. Mok Jin Woo threatens to kill Yeon Ho if she doesn’t tell him where the fountain pen is. While Yeon Ho persuades Mok Jin Woo that she has the pen, she also psychologically interrogates Mok Jin Woo of his past.