Jisoo returns to Sooya’s diary, the words of a woman whose life she’s quietly inhabiting cutting deeper than before. As Suho shares the heartfelt story of how he fell for her thirteen years earlier and the grainy ultrasound fills the room with a strong, steady heartbeat, the distance she’s forced between them starts to feel unbearable. In this borrowed life, his patient gentleness may be the one thing she can’t keep pushing away.