This study presented the results of the in - depth interviews with the teachers in charge to analyze the
change of curriculum management, performance, difficulties, and improvements in the free school system.
The main results of the study are as follows. First, in the second year of the free semester system,
teachers focused on the free semester administration and could not be interested in the connected semester.
On the other hand, in the third year, teachers focused on the connected semester. Second, it is difficult to
directly present the students' academic achievement through the second and third year of free semester system, but the teachers clearly affirm the positive emotional performance. And teachers showed that they
tried to improve the class by organizing the activities of the research society. Third, the difficulties
experienced through the second year of operation were the burden of making achievements and lack of
autonomy of curriculum operation. And the difficulties of the third year were difficulties of communication
among teachers and lack of time due to the excess of the achievement standards. Fourth, in the second
year, adequate budget allocation for the free semester was an important requirement, and in the third year
research school, it was required that the rational adjustment of the achievement standards of the revised
curriculum was necessary to connect the free semester to the general semester.