![ONF 2021 LIVE CONTACT :: CODE #1. [REVERSE]](https://image.tmdb.org/t/p/w342/4wjPi5x2igYJI9jrbE5QcJhSW8X.jpg)
[Reverse] is the first concert held by ONF. It was held across four days from December 9-12, 2021, at Yes24 Live Hall in Seoul, South Korea.
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