This plot point is trending because it subverts typical historical drama tropes and directly references Suyang Daegun, a notorious figure known for usurping the throne, immediately hinting at a dramatic and potentially controversial storyline.
In Joseon dynasty history, if a king was too young to rule, the Queen Dowager (his mother) typically served as regent. Suyang Daegun was a historical Grand Prince who famously usurped the throne from his young nephew, King Danjong, making this plot setup highly provocative.
A new historical drama (or perhaps a web novel/webtoon setting) has got Korean netizens scratching their heads! The premise features a young king, but here's the twist: the regency isn't being handled by his mother, the Queen Dowager (대비, Daebi), as is traditionally expected. Instead, it's the Grand Prince (대군, Daegun) – the former king's brother and thus the young king's uncle – who's calling the shots. This unusual power dynamic has quickly earned the Grand Prince the nickname '21st Century Suyang Daegun,' a reference that immediately sends chills down the spines of anyone familiar with Korean history. While more details are surely to be revealed, the idea of a Grand Prince acting as regent while the Queen Dowager is still alive and well is certainly raising eyebrows and sparking intense debate online about where this plot could possibly be headed.