It's the day of the primary simulation for Doc: Andrea for a day returns to wear the gown, but a sudden computer blackout of the hospital's systems forces him to a series of risky choices.

While the doctors are busy solving the delicate case of a deafblind boy, Cecilia makes Doc an unexpected offer, triggering the jealousy of Agnese and Giulia.

Giulia is forced into a showdown with her cumbersome mother when her partner is hospitalized in the grip of an inexplicable syndrome. Just when Doc seems to be returning to primary, Cecilia discovers something compromising about him.

When he is one step away from regaining the primary, Doc is forced to a painful confession in front of the whole department.

Locked in the ward in a forced quarantine, doctors are engaged in a fight against time to stop a multidrug-resistant bacterium that has infected them all.

Again with his white coat, Doc faces his first day as head physician. He has new responsibilities to manage without neglecting patients, despite pressure from the Administrative Director who threatens to close the department. Fortunately, Doc can count on his team, although Julia has not set aside the idea of leaving and Richard is challenged by the new residents.

Doc continues to dig into his memory and, now that he has finally met his "sail," he has a clear lead to follow. He has Giulia at his side who, in addition to Andrea's problems, must also think about her career. Meanwhile, a famous travel blogger is admitted to the ward and entrusted to Federico's care. But this encounter is likely to create more than a few problems.

The search for Doc's memory seems to have come to a dead end, but Andrea has found a new "sail": the upcoming choir competition in honor of Mattia. While he tries to convince Agnese to accompany him, in the ward Federico ends up under pressure, and Riccardo is faced with a case that sends him into crisis and pushes his relationship with Martina to the limit.

Doc finally knows how to track down the woman he is looking for, but he must first find the courage to do so. Meanwhile, Ric faces the case of an undisciplined personal trainer, while Damiano must deal with the hospitalization of a model, his brother Samuele's girlfriend. This case threatens to bring up old family grudges.

The fear of discovering the secret about his past is too strong for Doc. However, this denial of the truth drives him away from the ward, much to the surprise of Giulia, who has to take care of a patient who, just like Andrea, seems to be hiding something. Meanwhile, Enrico must deal with Barbara's assaults, which may be hiding more than just infatuation.

A violent earthquake sows panic at the Ambrosiano Hospital. Lin is afraid for her family; Ric decides on Laura's proposal; Federico has to perform a surgery for which he does not feel ready; Martina has an encounter that threatens to bring up her secret; Giulia, on the other hand, has to manage the ward because Doc is stuck in an elevator and has to save a pregnant patient.

The deadline to submit the research is approaching, but Giulia seems to have other things on her mind. Even Doc struggles to manage the myriad commitments: there's the meeting with the funders and then there's Carolina, who is in town for a few days. Everything takes a back seat, however, when Lin's sister is hospitalized. A case that will force the resident to come to terms with her father.

Giulia must make a decision about her personal life that will also affect her career. While Martina faces the most difficult exam of her life, Ric takes on a case that will force him to come to terms with Alba's ghost. Lin and Federico, on the other hand, get back to work on the database, but they risk bringing Doc closer to the truth that Agnese has been hiding from him.

Andrea is forced to come to terms with Agnese's illness, but unexpected news from America reawaken his hopes. At the hospital, however, the new head physician is challenged by a case that will force someone to make a terrible compromise. Meanwhile, Lorenzo is entrusted with a patient who has arrived from a nursing home and has been prescribed an overdose of medication.

In the ward, the moment of truth has arrived. As Federico faces his last day at Ambrosiano Hospital and Martina makes a decision that leaves the rest of the team stunned, Doc must come to terms with the truth Agnese has told him. He is convinced that it can't get any worse - until the man responsible for it all, his worst enemy, is admitted.

The arrival of a patient who is particularly important to Giulia intensifies the competition between the interns and Andrea has an opportunity to really get to know them. Meanwhile, he involves the ward in the search for his email account password, which could help him reconstruct a key part of his past, but which someone wants to hide from him at all costs.

Giulia brings Andrea back to the ward for a patient who has asked to be exclusively examined by him and who does not know about his current condition. An error caused by his amnesia puts all the trainees under pressure. Meanwhile, Alba is forced to confront the resentment she feels towards her mother.

A special episode set ten years earlier. Andrea, an enthusiastic doctor who is still together with his family, has an opportunity to make a career jump for the first time. But it is a struggle to hold everything together: suddenly finding himself involved in a rivalry with his colleague Marco, he risks losing sight of who he really is.

Carolina, who is suffering from a mysterious illness, is admitted to the ward, triggering a series of conflicts between Andrea and Agnese that they will have to overcome for their daughter's sake. Meanwhile, a flashy influencer attracts the young trainees' attention and Alba cannot disguise her jealousy towards Riccardo.

In an attempt to return to his role as a father and to help Carolina recover from her illness, Andrea starts to pursue Agnese again. A bad headache creates problems for Gabriel while treating a patient. Elisa and Riccardo have to deal with an aspiring astronaut.

Andrea is confident that he has finally won over Agnese and, feeling romantic, he suggests that a wedding is organised in the ward for a patient in critical condition. Meanwhile, Gabriel makes an unexpected proposal that upsets the balance within the group of interns.

A patient sheds light on a secret about Lorenzo's private life that causes a stir throughout the ward. Meanwhile, Gabriel and Elisa must attempt to reconstruct the life of an elderly inpatient who appears not to remember anything about himself, but repeatedly utters a single word.

After finding the medical file on the patient who died because of a mistake, Andrea tries to reconstruct what happened before the shooting that wiped out his memory. Marco, who was responsible for this death, and Agnese are uncooperative. Alba and Riccardo struggle to rebuild their relationship and things also get complicated between Gabriel and Elisa.

A train accident turns the Internal Medicine ward into an improvised emergency room. All the doctors are required to do their best to deal with the emergency. One of the wounded is a girl who reopens an important chapter in Riccardo's past that the young man had considered closed forever.

The arrival of Elisa's older sister in the hospital, a likeable, charming actress, inexplicably makes the young trainee even more surly and bad-tempered. Andrea continues to delve into the years that amnesia has wiped out, while Agnese cannot mask her jealousy over the growing rapport between Giulia and Andrea.