The plot was good at the beginning it just kept getting less interesting and was like unplanned for example :
1) They exaggerated the role of Healers and then made it like seem unuseful they wanted to send a message that what you get you lose something in return but it wasn't a reason for the progress of this twist

2) They made it clear that the mother could only save espers but not incurable disease so that was the reason she didn't save the twins but made it hard to achieve it with her daughter when she is a healer too and the Qis are espers so that mean they can be saved but then the plot became unplanned to the point. That made the plot messed up as if the screen writer made two plots and then made a mistake mixing them together so the reasons and results became invain at the last episodes .
3) QT character wasn't Really planned well , I'm not talking about the actress she made me feel every single emotion but, I'm talking about the writer
4) the protector and healers relationship was too plain just like that of the healer-espers it was just giving briefs of the two relationships without clearing anything
5) There are some points which were neglected like: * the protection ring that saved her when she saved QT first time why can't she save QT with the help of that ring ? * if the healers , espers and protectors can't use their powers why to be granted with them from the beginning ? * why is it only QT to suffer from losing her life but not her brother too ?
6) They only focused on the progress of their romance but not the main plot which made it messed up at the end That's why I gave it 5 only for the sake of actors who expressed their roles very well