What "Boys Over Flowers" actor co-starred in The Legend of the Blue Sea with Jun Ji-Hyun?
The Legend of the Blue Sea: The Legend of the Blue Sea () is a 2016-2017 South Korean television series starring Jun Ji-hyun and Lee Min-ho. Lee Min-ho (actor, born 1987):  He first gained widespread fame in Korea and parts of Asia with his role as Gu Jun-pyo in "Boys Over Flowers" in 2009.
Lee Min-ho