"Good Doctor" Joo Sang Wook tries to train Joo Won by doing a mock-surgery to practice.

September 10, the 12th episode of the KBS drama "Good Doctor" featured Kim Do Han (Joo Sang Wook) starting to train Park Si On (Joo Won) for special emergency circumstances during surgery.

Kim Do Han and Park Si On pretend that there is a patient on the surgical table. Park Si On focuses on the mock-surgery listening carefully to what Kim Do Han is instructing him to do. However, at a critical moment, the surgical knife slips from Park Si On's hand and is unable to continue with the mock-surgery.

Kim Do Han tells him, "The patient is dead. You think you changed and that you are better than before but from the way I see it, there is nothing that changed."