Han Tae Sul, a co-founder of Quantum and Time, is a genius engineer with the highest level of coding skills with outstanding good looks that outweighs his engineer fashion sense. Due to his innovative achievements, Quantum and Time is a world-class company, dubbed as "The Miracle of South Korea's Engineering Industry". In reality, Tae Sul has caused his company's stocks to constantly fluctuate after the death of his brother ten years ago. One day, after witnessing the unbelievable truth of his brother's death, he sets off on a dangerous journey. Watch drama online for free.