This is a magical story of 2 people, Lex and Karen, from different timelines - 13 years apart - connected by a mysterious comet through a dating app. As they grow close, Karen asks Lex to change key moments in her past to prevent her parents' separation. But every change of the past brings unforeseen consequences, altering their futures in unexpected ways. In one last effort, Lex hopes to set things right, but some events may be beyond control.