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An activist is stopped by police officers from inflating a balloon containing “letters” to President Park Geun-hye, at Gwanghwamun Square in central Seoul, Monday. A liberal group said it attempted to send the balloon over Cheong Wa Dae, about a kilometer away, because Park had refused to meet them. In the letter, it urged Park to uncover the truth behind the April 16 sinking of the ferry Sewol. / Yonhap