During a recent interview to talk about "The Legend of the Blue Sea," veteran actor Sung Dong Il praised his co-stars Jun Ji Hyun and Lee Min Ho for their personality and professionalism as actors.

Sung commended Jun for her dedication to her work, stating that the actress remains punctual every time they are scheduled to film for the drama series. "Jun Ji Hyun has great diligence. She always arrives early to the set to prepare, and I get amazed when I see her acting as a mermaid," he said as per Allkpop.

The veteran actor then moved on to Lee whom he described as a good person. "He has a great personality and I can feel his passion for acting each time we film," Sung said.

He also commended the on-screen chemistry of Jun and Lee on "The Legend of the Blue Sea," adding that he is just impressed with how the two dedicate themselves to their work.

Meanwhile, "The Legend of the Blue Sea" is currently dominating the Wednesday-Thursday 22:00 timeslots in terms of viewership, surpassing "Weightlifting Fairy Kim Bok Joo" and "Oh My Geum Bi," Soompi cited.

According to reports, the Lee Min Ho-starrer drama recorded a viewership ratings of 18.9 percent for their Dec. 1 episode. On the other hand, "Oh My Geum Bi" settled with 5.5 while "Weightlifting Fairy Kim Bok Joo" earned 4.6 percent viewership ratings.

Ahead their seventh episode of Dec. 7, "The Legend of the Blue Sea" shared a few photos of their filming in Palau. Actress Jun even shared a funny experience when she and Lee rode a bike and fell after losing their balance.

While Lee thought his on-screen chemistry with Jun enticed many viewers to keep watching "The Legend of the Blue Sea" despite some controversies accusing the drama series of copying other productions.

Watch "The Legend of the Blue Sea" every Wednesday and Thursday on SBS.