The journey of Han Tae Sul, a genius engineer who tries to discover the existence of a hidden life in our world, and the Savior Kang Seo Hae, who has made a long and dangerous journey for him. Han Tae Sul is a genius engineer and the co-founder of Quantum and Time Company. He is handsome and he produces innovative results. Thanks to his efforts, Quantum and Time has become a world-class enterprise. He is known as a miracle worker and a hero in Korea, but reality is a little different. After his older brother's death 10 years ago, he has exhibited eccentric behavior. The company's stock price has fluctuated accordingly. One day, Han Tae Sul learns of an unreliable truth behind his brother's death. His dangerous journey begins. Kang Seo Hae is an elite warrior. She can take down the biggest men with just her bare hands. She is also a sharpshooter and able to make bombs. She learned these skills to survive in a world that is dominated by gangsters and military cliques. One day, after a long and dangerous journey, she comes to Han Tae Sul to save him.