Actor Song Joong-ki and actress Song Hye-kyo will leave for Hong Kong to promote their drama "Descendants of the Sun" next month, the actor's talent agency said Tuesday.

They will likely hold a promotional event some time before April 6, which is when the KBS 2TV series will premiere on the channel Viu TV in Hong Kong, Blossom Entertainment said.

It'll be their first promotional tour abroad since the show, broadcast simultaneously in South Korea and China, started last month.

It's unclear whether or not there will be more stops for overseas promotion, an agency official said.

The broadcast rights to "Descendants of the Sun" have also been licensed to a Japanese network for US$100,000 per episode.

In China, the show is released on the video platform iQiyi (Yonhap)