• Song Hye Kyo arrives for the red carpet of the 17th Shanghai International Film Festival at Shanghai Grand Theatre on June 14, 2014.

Song Hye Kyo arrives for the red carpet of the 17th Shanghai International Film Festival at Shanghai Grand Theatre on June 14, 2014. (Photo : Getty Images/Feng Li)

Fans of "The Legend of the Blue Sea" are in for some treat. With only seven-episode left, Song Hye Kyo is rumored to join lead stars Lee Min Ho and Jun Ji Hyun in the SBS drama. 

Song, who portrayed Doctor Kang Mo Yeon aka Beauty in the 2016 hit drama "Descendants of the Sun," will be playing a pivotal role in "The Legend of the Blue Sea," according to The Korea Portal. She will reportedly transform into a malevolence mermaid queen.

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Though nothing has been set in stone yet, many are hoping that her appearance will bring some new twist and turns for Shim Chung (Jun) and Heo Joon Jae (Lee). They also hope that the SBS drama will finally unveil some shocking revelations.

This comes after "The Legend of the Blue Sea" faced a storm of public criticism because of its slow plot development and similar storyline with the 2013-2014 hit drama "My Love from the Star." Hence, producing-directors (PD) Jin Hyuk and Park Seon Hoo decided to unveil key plot developments in the upcoming episodes.

Heo Joon-Jae's strained relationship with his father (Choi Jung Woo) and step brother (Lee Ji Hoon) will be furthered explored as the show goes on, a source from the SBS drama told Korean news outlet iNews 24, as cited by Soompi. The character connections and events, both present and past, are also expected to become deeper and more intertwined.

As the 20-episode drama nears the end of its two-month run, SBS aired a special movie-like episode that told a not-before-seen story between Shim Chung and Heo Joon Jae. The said abridged edition recounted their romance from the Joseon dynasty until the 21st century.

Meanwhile, "The Legend of the Blue Sea" episode 14 will be released on Jan. 04 at 10:00 PM (KST). Here is the preview for the next episode: