Starling by Each Step aka Scarlet Heart was remade in 2016 as Moon Lovers: Scarlet Heart Ryeo with an entirely new cast and a scintillating and engrossing script that far surpasses this iteration. The Princes in SC-Ryeo were pure eye candy but in this version they all come across as old men with ugly hair styles and boring personalities. Bottom line, don't bother with this version, go straight for Scarlet Heart Ryeo.
(The series tells the story of a modern-era woman, Zhang Xiao, who time-travelled from the 21st century to the Qing Dynasty during Emperor Kangxi's reign, where she, as her previous incarnate Ma'er'tai Ruoxi, encountered the Emperor's sons, who were involved in a lengthy battle for the throne. During the course of the series, the female protagonist would meet and eventually fell in love with Fourth Prince Aisin Gioro Yinzhen, who would later on ascend the throne as Emperor Yongzheng. The plot of the series was largely reminiscent of the original novel's plot, though the series's ending differed from that of the novel, along with a few minor differences from both the series and novel.)