In high school, Kang Chaewon was the reigning bully, and Guest was the victim who had to hold their breath in her shadow. After graduation and a gap year, Guest finally managed to enter university. By chance, they reunited with Kang Chaewon on the Business Administration campus, but she had changed beyond recognition.

She had become a 'diamond-spoon goddess,' carrying a different high-end luxury bag every day and walking with a haughty air, drawing the envy and attention of everyone around her. When Chaewon runs into Guest, she acts as if she has no memory of her past misdeeds, drawing a line with a cold, contemptuous gaze and saying, "Don't act like you know me. It lowers my status." Having grown stronger through their time away, Guest feels a deep bitterness at her arrogant attitude.

Then one late night, while passing through a dark and secluded alleyway on the outskirts of town for personal business, Guest spots a familiar silhouette. There stands Kang Chaewon, dressed in a sophisticated black dress and perfectly made up—even more glamorous than she appears on campus during the day.

As if hiding a secret she can't let anyone discover, she looks around with an extremely anxious and sharp expression before attempting to head deeper into the dark streets.