As Doldam Hospital suffers from a lack of doctors, Kim Sa Bu visits the main hospital to ask to send young doctors to him and runs into CS fellow Cha Eun Jae and GS fellow Seo Woo Jin. Seo Woo Jin is ostracized by other doctors because he had done whistleblowing on other doctors' corruption and malpractice. On the other hand, Cha Eun Jae always takes a tranquilizer before operations due to her operation fright.

Kim Sa Bu gets disappointed at Woo Jin and tells him to go back. But Woo Jin asks Kim Sa Bu for one more chance and Kim Sa Bu gives Woo Jin a week of grace period to prove himself. Meanwhile, an important figure comes into the emergency room of Doldam Hospital. Do Yoon Wan, the chairman of the Geosan University Foundation figures out the news and begins to work out his scheme.

Dr. Kim chooses the extreme method to save Minister Ryu. After Dr. Kim manages to bring Minister Ryu back to life, Park Min Kook starts doubting on Dr. Kim’s real intention and skills. After Park Min Kook announces the Minister’s condition to press, Dr. Kim just doesn’t seem to care. Cha Eun Jae asks Woo Jin to attend the second surgery but he refuses.

Park Min Kook asks Woo Jin questions about the primary surgery that Kim Sa Bu operated and Woo Jin hesitates to answer them. The director of Doldam Hospital comes back to the hospital and Ah Reum greets him. Eun Jae gets furious on Woo Jin for taking away her opportunity to be in the second operation with Park Min Kook. And Doldam Hospital is on the verge of being sued for malpractice.

Friday is the busiest day as a lot of patients swarm in Doldam Hospital. Eun Jae still finds it hard to perform surgical operations herself. A girl patient who suffers from drug poisoning because of her father's joint family suicidal attempt reminds Woo Jin of a painful memory from his childhood. And the staff of Doldam Hospital resents after hearing a rumor that there will be a new director.

Teacher Kim leads his team in saving two critical patients at the same time. Eun-jae steps in to protect a woman from her abusive husband.

Min-guk becomes determined to turn people away from Teacher Kim. A situation Eun-jae tries to mitigate takes a turn for the worse.

Even in her final moments, a paramedic save another's life. Woo-jin shows Eun-jae his way of resetting the mind from worries.

Woo-jin looks into diagnoses for Teacher Kim's arm pain. A bus accident conjures up a regretful moment that haunts Min-guk's conscience.

Yoon A-reum protects a patient's rapekit from failing into wrong hands. Min-guk finally brings up the bus accident from 11 years ago to Teacher Kim.

Min-guk asserts his authority by restructuring the hospital staff. Woo-jin is stunned to learn which surgeon was behind a faulty operation.

A recruiter with bitter resentment for Woo-jin tries to tempt staff members to leave Doldam Hospital. Eun-jae's mom asks for a favor.

Eun-jae panics when she runs out of medication from Teacher Kim before surgery. Woo-jin gets coerced into leaving Doldam Hospital.

Teacher Kim tasks Woo-jin with a final assignment. Min-guk performs surgery on a VIP patient despite pushback from Shim Hye-jin.

Do In-beom returns to Doldam Hospital to investigate an unsuccessful surgery. Min-guk decides between his greed and the truth.

Bae Mun-jeong comes clean to Woo-jin about the connection between their families. Teacher Kim secures a safe future for Doldam Hospital.

The medical staff of Doldam Hospital fly out in a helicopter to a ship lost out at sea on behalf of Teacher Kim, who is absent on vacation.

As the patient's lung condition deteriorates due to tuberculosis, Teacher Kim opens the trauma centre operating room for Ri Bok-young's surgery.

Doldam Hospital hires new personnel. The people of Doldam, who thought Teacher Kim would be the new head of the trauma centre, hold an emergency meeting.

Patients injured in a residential fire are rushed into the emergency room. Woo-jin treats the suspected arsonist despite Dong-hwa's criticism.

Cha Jin-man hates that Teacher Kim's methods are deeply rooted into Doldam Hospital and takes everyone except Sun-woong and Dong-hwa to the trauma centre.

The trauma centre loses a patient and receives another patient in critical condition. Meanwhile, a child visits Teacher Kim at Doldam Hospital.

Wounded soldiers are rushed to Doldam Hospital. Ah-reum is left alone to tend to the emergency room when rogue patients suddenly cause a scene.

Patients rush into the emergency room while the staff tends to surgeries. Doldam Hospital falls into chaos as the gunman's identity is revealed.

When an old building collapses resulting in several casualties, a disaster medical support team is dispatched to the site.

Doldam Hospital receives news of a second collapse, but the place is still full of injured people. Teacher Kim leaves everything and heads to the scene.

Ko Kyung-sook does not give up the legal battle over her son's death. She proposes a secret deal to bring down Cha Jin-man, but Teacher Kim opposes to it.

Cha Jin-man fails to find the culprit who broke into the director's office. His reputation is further ruined as incidents from his past become known.

Kang Dong-joo returns to Doldam Hospital, with his unconventional proposals causing a stir in the trauma centre.

Eun-jae performs emergency surgery on a non-trauma patient while she must join another surgery for a patient with multiple trauma.

People injured from a forest fire rush into Doldam Hospital. Yet, the trauma centre is empty due to the staff staging a boycott against Kang Dong-joo.

A fire approaches as if it would devour Doldam Hospital at any moment. Only after evacuating all the patients do the staff realise Teacher Kim was gone.