Brain

Lee Kang-hoon (Shin Ha-kyun) is a neurosurgeon in his early 30s. He graduated from Korea's most prestigious medical school with the best grades and completed his residency. Ashamed of his poor, uneducated parents, he has sworn since he was young that he will change his own fate. He chose neurosurgery, the least popular department, because there he can easily gain privileges by making connections with senior doctors. Seo Joon-suk (Jo Dong-hyuk), who was born with everything, is the person Kang-hoon despises the most and views him as his rival. Kim Sang-chul (Jung Jin-young) is a caring, empathetic neurosurgeon professor in his mid-50s who acts as a mentor to Yoon Ji-hye (Choi Jung-won). Joon-suk likes Ji-hye, but she has feelings for Kang-hoon. The series takes a shocking turn when Kang-hoon learns that Sang-chul caused his father's death.