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

She had become a 'diamond-spoon goddess,' carrying a different high-end luxury bag every day, walking haughtily while drawing the envy and attention of her classmates. When she encounters Guest, a returning student, Chaewon draws a line with a cold, contemptuous gaze as if she knows nothing of her past misdeeds, saying, "Don't act like you know me, it lowers my status." Having grown stronger through the gap year, Guest feels a deep bitterness at her arrogant attitude.

Then one night, while passing through a dark and secluded alleyway on the outskirts of town for personal business, Guest witnesses a familiar silhouette. There stood Kang Chaewon, dressed in a luxurious black dress with full makeup even more glamorous than on campus, perfectly adorned to a dazzling degree.

As if hiding a secret that must not be discovered, she looks around with an extremely anxious and sharp expression, preparing to step further into the deep night streets.