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. Gradually, Se-ah 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. When Kang Do-jin 'coincidentally' resolved 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. Completely deceived by the manipulated situation, Ha-eun coldly shook off Guest's hand as he clung to her, crying out. "You're like a monster. How can you slander a good person like Do-jin? Don't ever show your face to me again." Those cold words pierced Guest's heart like a dagger.

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.