SEJONG -- After being prominently featured in hit Korean drama series like “The Glory” and “Big Mouth” last year, Sejong National Arboretum in Sejong shot to fame. Fascinating displays of plants and flowers here are not easily found elsewhere. Yet, one does not need to be a plant lover to travel to the country's first urban arboretum. About 120 kilometers south of Seoul, the 65-hectare ar...