With each others' promises to go to the same college, Zi Wen and Zhang Xuan had a close but subtle relationship. Zhang Xuan's talent and Ziwen's unspoken secrets disclose the story of its own. A story unveils the conflicts between friendship and the dark side of the protagonist.
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.