The summary kinda takes you away from the main idea of the drama which is simple, "what if", a modern day man with modern day thought process, values, and scientific mindset is reborn into history itself, still preserving his values and memories from his previous life. The best part probably about this drama is that looks were not given as much importance as the plot of this drama & the acting itself. If I say anything else I'd be ruining the drama so to briefly summarise, you really can't miss this one!