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 had spent five years with and promised a future to, started getting out of Kang Do-jin's luxury car one day. She coldly pushed away Guest's worried questions, dismissing them as 'delusional jealousy' 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 holding her back. Se-ah gradually began 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 ten years who should have been the only comfort for the despairing Guest, could not escape Kang Do-jin's trap. As Kang Do-jin 'disguised as a coincidence' solved a sudden economic crisis hitting Ha-eun's family, 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. Ha-eun, completely deceived by the fabricated situation, coldly shook off Guest's hand as he clung to her wailing. The cold dagger of her words, "You're like a 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.