What is a good teacher?

Twenty-five-year-old Ko dreams of becoming a teacher. As a child, she was saved by Chaichana, an event that made Ko want to be a good teacher like Chaichana. However, she comes to question what it is to be a good teacher. Ko becomes a teacher as she had hoped, but being a teacher is not easy when she has to face with the education system and the administration of Phatham School.