Moon Seong-hyeon is a character who young Doctor Frost met in the library after losing his memory and is going to add energy to the drama.
When Moon Seong-hyeon appeared, Song-seon (Lee Yoon-ji) said, "Baek would be so pleased to hear that you're back". Moon Seong-hyeon said, "I missed you all".
Meanwhile, "Doctor Frost" is based on a popular web-toon about a genius psychologist helping to solve crime with the investigative team. The drama stars Song Chang-eui, Jung Eun-chae, Sung Ji-ru, Lee Yoon-ji, Choi Jung-woo and more.
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