Guest's ordinary but happy daily life began to twist grotesquely the moment a man named Kang Do-jin appeared. Han Se-ah, the girlfriend you spent 5 years with and promised a future to, started getting out of Kang Do-jin's luxury car at some point, and coldly pushed away Guest's worried questions, dismissing them as 'paranoia' and 'inferiority.' While providing Se-ah with irresistible career opportunities and material abundance, Kang Do-jin meticulously planted the illusion that Guest was incompetent and blocking her path. Se-ah gradually came to view Guest as an embarrassment, eventually declaring a breakup and heading into Kang Do-jin's arms.

Even Yoon Ha-eun, the female friend of 10 years who should have been the only comfort for the despairing Guest, could not escape Kang Do-jin's trap. When Kang Do-jin resolved a sudden economic crisis in Ha-eun's family by 'disguising it as a coincidence,' he became an absolute savior to her. Kang Do-jin presented Ha-eun with false evidence that Guest was obsessed with inferiority, slandering him and harassing Se-ah. Completely deceived by the manipulated situation, Ha-eun coldly shook off the hand of the wailing Guest who tried to hold onto her. The cold dagger of her words, "You're like a real monster. How could you slander a good person like Do-jin? Don't ever show your face in front of me again," pierced Guest's chest.

Now, no one is left by Guest's side. Both the lover you loved most and the friend you trusted most have left, pointing at Guest as the perpetrator under Kang Do-jin's perfect script.