Song Joong-ki, Song Hye-kyo to Wed in October

Song Joong-ki and Song Hye-kyo in a surprise announcement on Tuesday said they will tie the knot in October.

Their agencies in a press release said the wedding will take place on Oct. 31.

The two appeared together in the megahit TV series "Descendants of the Sun" early last year, but even after the finale they denied rumors that they became romantically involved in real life.

"They hesitated to admit their relationship because marriage is a matter involving the whole family, so they wanted to wait until everything was decided to make it official," according to the press release.