Years after the heartbreak, they crossed paths again... but this time, they told themselves to stay apart – to protect what's left of their hearts. It had been a long time since Cate and Karl last spoke. They were young, in love, and completely broken by the end. Life moved on. Cate learned how to smile again. Karl learned how to be okay without her. But fate has a strange way of bringing back the people we tried so hard to forget. When their worlds collide once more, the feelings they buried resurface. But they're no longer the same. They're more mature now. More cautious. More afraid of getting hurt. They tell themselves: Some things are better left in the past. But their hearts keep asking: If love knocks twice... will you open the door again?