A producer on the SBS drama "Jang Ok Jung" says he cast Hang Seung Yeon of K-pop group KARA on the show before realizing who she was.

"I didn't know very much about Han Seung Yeon," producer Bu Sung Cheol said Tuesday, according to the website Soompi. "There were two final candidates for her role and I decided to cast her without knowing that she's a member of KARA."

Sung Cheol says he doesn't feel the KARA singer should have her K-pop star status held against her.

"When Han Seung Yeon first walked into the office, I thought she looked just like how I imagined [her "Jang Ok Jung" character] Sookbin to be," the producer said. "I don't think she needs to be discriminated reversely just because she's a member of an idol group. Of course, I expect her to bring in more viewers and that's a part of the reasons why I cast her."

KARA released their most recent single "Bye Bye Happy Days" last month.

The video has over 650,000 views on YouTube since being uploaded on March 13.

Han Seung Yeon's "Jang Ok Jung" character Sookbin Choi is a maid who becomes a Kim Sukjong's concubine.

The drama is which is based on the novel, "Jang Hee Bin, Live for Love," which premieres on April 8.

The story, based on true historic events, traces King Kim Sukjong played by Yoo Ah In and his concubine Jang Ok Jung, later known as Jang Hui Bin, played by Kim Tae Hee.

Seung Yeon's "Jang Ok Jung," co-stars were getting pretty hot and bothered on the set, according to allkpop.

"To be honest, while acting, I would let my guard down and steal glances at her," Yoo Ah In said of his co-star on Wednesday night's episode of "One Night of TV Entertainment" on SBS . "I mean she is Kim Tae Hee!"

Tae Hee, shot back that she was distracted by Yeon's hungry stare.

"What are you talking about?" the model asked. "While acting with Yoo Ah In, I forgot my lines because of his intense eyes."

According to a producer on "Jang Ok Jung," Yoo Ah In wasn't the only one distracted by Kim Tae Hee's beauty.

The crew's star-struck behavior was all too apparent when a scene required Kim Tae Hee to be splashed with water outdoors on a freezing day in February.

"We had a total of 8 [retakes] before we filmed the scene correctly," the producer told the Korea Star Daily. "I'm not sure if it was because Kim Tae Hee was too beautiful and that's why we kept missing her when we threw the water, or whether it was because the staff were too selfish and the longer we filmed, the longer Kim Tae Hee stood there smiling."

 "It was so cold that day that the water was frozen," a cast member added. "Even though the scene was redone many times, Kim Tae Hee didn't show any signs of frustration and remained in high spirits throughout."

See the KARA video for the song "Bye Bye Happy Days" RIGHT HERE: