Who is Heo Nam-jun, the latest heartthrob from 'My Royal Nemesis'?

For K-drama fans, "My Royal Nemesis" is the clear watercooler show of the season.

The unlikely courtship between a woman from 300 years ago and a modern-day chaebol has pulled off a rare dual triumph, topping both domestic linear broadcast ratings and Netflix's viewership charts.

But the drama's most notable success story may be the emergence of its leading man, Heo Nam-jun.

A relative newcomer who has morphed into one of the market's hotly sought-after talents, Heo's rapid rise may suggest a bo ...