Tokai-sensei has a strong characterization that drove the dorama into a great emotional roller coaster. Unfortunately, the dorama is too focus to the sophisticated instrument, it forgets to explore the human relationship. Sera being the most developed character, but I do hope he has more contradictive interaction with Tokai-sensei. Also, other characters are under developed and have not-that-much significant to the story line. Also, I still don't get it why they have so much chit chat in the ope room while the time to operate is limited.