Park Hae Jin and Choi Yoon Young were on the set of KBS drama "My Daughter Seo Young."

In the picture, Choi Yoon Young has completely transformed into Choi Ho Jung, who's completely in love with Sang Woo (Park Hae Jin), and Park Hae Jin seems charming as the doctor Sang Woo.

Park Hae Jin found a mop while the cameras were not running and is comparing Choi Yoon Young's height with the mop. As he is joking around, the whole cast and crew erupted into laughter. 

Internet users said, "Park Jung Ah must be jealous." "I hope that Sang Woo smiles like this in the drama." "I love just looking at Park Hae Jin!" "Fighting for 'My Daughter Seo Young!'"

"My Daughter Seo Young" is currently recording 30% viewer ratings.