Watch Swimming in the Dark for Free: How to Stream the Movie Online at 123Movies. . When the swimming competition is coming, Wen is under lots of pressure, so it's gloomy this summer. Ann, who is inseparable beside her, found out something different. To confront Wen’s closure and trauma, Ann decides to be closer to Wen. But, when she gets closer to Wen once, it pushes them further.