“Legend of the Blue Sea” released the behind the scene clip of Jun Ji Hyun!

On the latest behind the scenes clip, Jun Ji Hyun’s swimming skills were featured.

SBS released the clip on November 21 wherein the underwater scenes of the female main lead Jun Ji Hyun was highlighted.

She wore the mermaid costume and dived in the sea several times for the scenes. She also monitored herself and even practices when it’s not rolling showing how professional she really is.

Despite the hard time filming, Jun Ji Hyun didn’t show any discomfort.

Meanwhile, you can watch the third episode of “The Legend of the Blue Sea” this coming  November 23 at 10 p.m. KST.

Check out the behind-the-scenes video here!