Chen Chang-jui, Kuo's fifth-grade homeroom teacher and a great lover of music and athletics, led students in singing together and specially taught six students, including Kuo, to play the harmonica.
公學校 5 年級時，喜愛音樂和運動的新任導師陳昌瑞，不僅帶領學生合唱，還特別指導包括他在內的 6 名學生吹奏口琴，陳昌瑞可算是他的音樂啟蒙老師。