A 24-year-old recent college graduate, Sujin prepares for advanced education overseas. One day, she receives a suspicious call. The caller Jiyeon claims to be Sujin’s daughter 20 years in the future. Sujin finds this claim ludicrous and ignores it like any other prank calls. To Sujins surprise, however, Jiyeon calls again at a promised time. Sujin tries to find hard evidence to prove that this is an ill-humored prank, but she cannot help becoming more distracted when Jiyeon reveals Sujin’s frustrated plan to pursue her studies and become a professor.

After having prepared for her dream for years, the revealation that Sujin will not become a professor comes to her as a shock. Now, Sujin begins to heed what Jiyeon has to say. Sujin consults with her best friend Hannah and boyfriend Hyeokgeon, but to no avail. As Jiyeon’s calls continue, Sujin’s confusion only grows. Interaction with Jiyeon now preoccupies Sujin, and Sujin can no longer
take it as a joke.

As Sujin is left confused about Jiyeon, Jiyeon drops another bomb. She shares how Sujin was derailed from her path to become a professor and what kind of life she has after marriage. Jiyeon reveals the story from her perspective as Sujin’s daughter. Jiyeon bursts into tears from the difficulty she has gone through herself, and Sujin continues to be mired. Jiyeon says what she wanted to say all along. “Mom, leave your boyfriend. Do not marry that man. Live your own life.”

Sujin doesn’t know what to do with Jiyeon’s plea to end her current relationship, pursue her career, and live abroad. Sujin wonders whether Jiyeon’s calls, what she told her of her future, and what Jiyeon has said are true. In the meantime, Sujin receives an acceptance letter from the academic program in Germany that she has been preparing for. Now, she is left with a choice…. Are Jiyeon’s calls true? The future Jiyeon shared -- is it true? What is Sujin going to choose?