Actor Kim Joo-hyuk and actress Kim Ji-soo have ended their relationship after six years.

Namoo Actors, their agency, said Thursday that they returned to being only friends about three months ago.

The two fell in love in 2002 when they starred as husband and wife in SBS TV drama ''Flowing River.'' Since then, they have been recognized officially as a couple in entertainment circles. At one point, rumors suggested they were set to marry.

Kim Joo-hyuk, 37, made his acting debut in 1998. Most recently, he has been shooting the movie ''Bangjajeon.''

Kim Ji-soo, also 37, debuted as a TV actress in 1992 and made her first film appearance in ''This Charming Girl'' in 2005. The film was well received by critics. She starred in KBS TV drama ''Woman of the Sun'' last year.

sahds@koreatimes.co.kr