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Bomb in the Train (1x29)

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Gon, So Young, Hak Jae, and Seung Mok evacuate the passengers from the train. When they think there's no one left in the train, they find Se Yeon with a bomb on her body. They soon realize the bomb cannot be disarmed by force. Gon decides to stay with Se Yeon until the very last moment. Meanwhile, Yu Na requests a warrant to arrest Se Hwang.