° Joo Won as Park Shi On ° Moon Chae Won as Cha Yoon Seo ° Kim Young Kwang as Han Jin Wook ° Joo Sang Wook as Kim Do Han ° Kim Min Seo as Yoo Chae Kyung
Park Shi On is an autistic savant who was sent to a specialized care center as a child, where he was discovered to have a genius-level memory and keen spatial skills.
He eventually enters the field of pediatric surgery as a resident, where he is given six months to prove himself capable. However, due to his atypical mental and emotional condition, Shi On faces conflict from his peers and patients, who view him as childlike and unreliable.
Most critical is the hotheaded surgeon Kim Do Han, who labels him a soulless robot of a doctor who can only rely heavily on his photographic memory instead of feeling what the patient needs.
Despite help from understanding and fair colleagues like Cha Yoon Seo and Han Jin Wook, the hospital is a fierce and competitive world, and the challenges Shi On faces become only greater when he falls in love with Yoon Seo
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