Lee Soon-jae, one of South Korea's most beloved actors, died on Tuesday at the age of 91, his agency announced.

In a career spanning more than 70 years across films, television and the stage, Lee was fondly known as the "national TV dad" for his many roles as a wise, older man.

This included two of his best-known performances - as a strict father in the 1991 soap What on Earth is Love, and a silly but lovable grandpa in the popular sitcom High Kick! which aired from 2006 to 2012.

News of his death has sparked an outpouring of tributes from young celebrities, including K-pop singers, speaking of his warmth and kindness, to President Lee Jae Myung.

"From theatre to film and television, he brought us laughter, emotion, comfort and courage," the president wrote on Facebook.