Actress Ko Ah Ra introduces herself as cheerful and social as Sung Na Jung of the cable channel tvN's recently ended Friday Saturday drama "Reply 1994."

Even when she was filming her debut drama KBS's teen drama "Sharp" in 2003, she said hello to everybody in the KBS building.

Producer Shin Won Ho of "Reply 1994" remembered Ko Ah Ra of 15 years old. He transformed Ko Ah Ra's previous image as a goddess into Sung Na Jung.

Ko Ah Ra in the interview said, "In the first meeting with the production team of the drama, script writer Lee Woo Jung asked me, 'How will we ruin Ah Ra in the drama?' and I liked it a lot."

Producer Shin Won Ho and scriptwriter Lee Woo Jung explained the character of Sung Na Jung to Ko Ah Ra in detail, and her personality of drooling, eating a lot, and farting everywhere.

Ko Ah Ra replied, "This is the drama I have been waiting for. Eating a lot, farting, drooling, and the kiss scenes. I will do it!"

A month before the filming of "Reply 1994" started, Ko Ah Ra started living like Sung Na Jung. She gained 15 pounds, and kept eating without working out to gain more weight. She cut her long hair to look more like a tomboy Sung Na Jung. She wore baggy jeans with no makeup.

As a result of her effort to make the perfect version of her character, drama "Reply 1994" ended with the national viewing rate of over 10% and she attracted a lot of the attention of the fans and "Reply 1994" audiences.