What if the one person who had always been there for you was actually the one? Killian Jones has been best friends with Emma Swan since they were children. Soon, their friendship grows into an inseparable bond as the two best friends are now grown and sharing an apartment in New York. Killian starts to feel things for Emma that he's not too sure about. One day, Emma is introduced to a man during a case, and they begin to fall for one another. Is it too late for Killian to tell Emma that his feelings might be more than just friendship? Who will win over her heart? Find out in "What If?"