One day, I realized I had been reincarnated into a novel. And it was a power-hiding protagonist's overpowered rampage story that begins when his one and only precious son gets kidnapped by the mastermind. But I'm that mastermind's terminally ill daughter, and the reason mastermind Dad kidnapped the protagonist's son was to save me. Dad! Did I say I wanted to live this way? And even if I survive through such a method, I'll become the dungeon itself! I'll become the final boss monster, you know? I can't let Dad commit any more sins. I have to return the protagonist's son to the protagonist! *** "Dad!" "Do-hyun!" Seeing the protagonist hugging his son while shedding tears... I only thought, I should slip away now. "But who is this child?" I'm screwed. My collar was grabbed before I could escape. As expected of the former Rank 1, damn fast! The protagonist was looking at me with cold eyes, the tears from just moments ago nowhere to be seen. Do-hyun, save me! Perhaps understanding the meaning of my desperate gaze, Do-hyun hurriedly clung to his father's arm. "Dad! Don't do that! Seo-ro is... my friend." "Friend?" "Girlfriend..." "...So my daughter-in-law." No. That's not it.