Once Begins is the name for Twice's second anniversary fan meeting. JYPE released an introduction video of the fan meet on September 17, 2017. They also released individual photos of members wearing their outfit from "Like Ooh-Ahh" music video. The fan meet took place at Kyunghee University on October 14 and 15, 2017.

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Main Cast: Chou Tzu-yu, Yoo Jeong-yeon, Sana Minatozaki, Mina Myoui, Momo Hirai, Im Na-yeon, Park Ji-hyo, Son Chae-young, Kim Da-hyun

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