Yoo Oh Sung began to believe that Kim Hee Sun is a doctor from heaven, in the drama 'Great Doctor'
During the 6th episode of the SBS Monday Tuesday drama 'Great Doctor' that aired on August 28th, Ki Cheol(Yoo Oh Sung) realized Yoo Eun Soo(Kim Hee Sun)'s real identity, after seeing her surgical equipment.
Ki Chol asked Yoo Eun Soo to treat previous king, Kyung Chang goon, and said, "if you can't treat him, you aren't a doctor, but an illusion of a wicker person. So I will cut your throat," he then took away her equipment and tried to block her from treating the patient.
Ki Cheol lied and told king Gongmin(Ryu Deok Hwan) that Choi Young abducted Yoo Eun Soo in order to treat Kyung Chang goon. Due to Ki Cheol, Choi Young and Yoo Eun Soo were both in danger.
After a while, Ki Cheol saw Yoo Eun Soo's equipment and said, "I've seen this somewhere before," and was shocked. The relics that his teacher left him, looked exactly like Yoo Eun Soo's equipment.
Ki Cheol stated, "this is my teacher's relics. He stated that these are the relics of Hwata. That lady must be true. She is truly Hwata's student," and was surprised. He added, "she truly is the person from heaven, who is Hwata's person. That person is to be mine, she can't be hurt anywhere from her head to toe," and yelled.
Ki Cheol then began to desire Yoo Eun Soo as his own person, after realizing that she is a heavenly doctor.