After being reborn, the protagonist reviews the original timeline—five years ending badly—and decides to exploit foreknowledge: invest early in smartphones, premium liquor, food delivery and short videos, avoid startups and risky Bitcoin, and plan a trip abroad. That night at an internet cafe a classmate notices she's late and off; pressed, she reveals a boy named John has been openly pursuing her. She insists she'll concentrate on college entrance exams, but her money-making plan and John's pursuit clash, forcing her to face an immediate choice of priorities next.