Upon hearing that Woo-hae is ill, Je-yeon feels lost and returns to her parents' home. Meanwhile, Woo-hae doesn't want to hurt Je-yeon and tries to distance himself from her. He also prepares for the worst and becomes cold to Nu-ri and demands that she meet her birth mother and reconcile.

Woo-hae, whose health is deteriorating, hides his condition while growing closer to Je-yeon. Meanwhile, Nu-ri feels conflicted as she takes her practical exam and prepares to meet her birth mother. Seok-ju discovers Woo-hae's illness, leaving him in shock and guilt. Woo-hae is urged to join a clinical trial, forcing him to face the reality of his condition.