She graduated second in her class from Geosan University College of Medicine. She received high praise from Professor Oh Dong-sik, a CS specialist at Geodae Hospital, who said, "Even though she's a woman, she's smarter than most guys. Her grades were great, and she writes research papers better than most professors." According to Yoon Ah-reum, Professor Oh's sexism was so severe that all the students struggled, but Eun-jae became a role model for female classmates by being the only one to endure it. She was a doctor so talented that even someone like Professor Oh didn't hold back his praise. However, she had two fatal weaknesses: first, she often caused trouble by being stubborn, and second, she had a severe phobia of anatomical activities like cutting human bodies or the smell of blood, dating back to her fainting during dissection labs in college—a struggle she still hasn't overcome. To cope, she takes tranquilizers before surgery; if she takes them, she falls into a deep sleep during the procedure, and if she doesn't, she suffers from hyperventilation and a racing heart. She performed surgeries believing the pills were for her phobia, but in reality, the medicine Master Kim gave her was just a digestive aid, which is why she was always hungry after surgery. After learning the truth, she now manages herself well and participates in surgeries without the medication.

Seo Woo-jin is a lonely fighter who tries to prove his worth through his skills, fueled by the cynicism and inferiority complex formed by a childhood tragedy. He is a multi-dimensional character who finally begins to realize his calling as a doctor through his time at Doldam Hospital.