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. 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 is also a sharpshooter and able to make bombs. One day, after a long and dangerous journey, she comes to Han Tae Sul to save him.