The following YouTube clip of the "Diary" trailer provides a good sense of the drama and the humor about this look a life in a busy Parisian hospital.
Limited success in obtaining a lab coat introduces Benjamin to hospital bureaucracy and his status at that institution; this is despite his father being a senior doctor there.
The next rapid succession of wake-up calls begins with Benjamin learning about the number of patients in the ward to which he is assigned; his "its complicated" relationship with more experienced intern Abdel begins with that older man arguably being unduly assertive in how he steps in when Benjamin has difficulty with a medical procedure.
The first real doctor's life lesson comes on Benjamin losing a patient. The circumstances of that death lead to that kid throwing Abdel under le bus and giving viewers a few more reasons to avoid hospitals.
Benjamin survives to fight another day until facing his next major challenge, which also involves Abdel. The general consensus that an elderly cancer patient should be allowed to continue circling the drain becomes a bone of contention when the ICU team is called in to perform arguably heroic measures; Benjamin and Abdel stepping in to pull the plug on those efforts leads to a disciplinary proceeding with negative consequences for both men. Part of this involves Benjamin showing that he does not feel like working and playing well with others. This leads to a confrontation with even more dire consequences.
We additionally get several looks at the daily lives of the interns; this includes enthusiastic meting out of punishment for talking shop during meal times, watching reel doctors, arguing about who should work on holidays, and a New Year's dance party at which hospital staffers rock out with their docs out. A message here is that guilty feet have got no rhythm.
As mentioned above, the camera being an unobtrusive fly on the wall as all the action transpires greatly contributes to the realistic sense of "Diary." This makes this film one from which both medical students and producers of reality TV shows can learn.