Srinuan is a school teacher in classroom #650. Her nephew is a young musician who never likes to go to school, so she makes him practice his musical skills at home and even adapts some of the school subjects into the lyrics of the songs. This method really helps her students improve their memories, and they all do very good in the examination. The song becomes a hit, and a very popular studio owner offers to produce the tape for the song, but Srinuan makes a demand for the royalties. On the Teacher Appreciation Day party, the band together with the students from class room #650 play only those Songs, which makes Srinuan and the whole school very proud of them.