After graduating from university, Lam decided to return to his old high school, Pooi To Middle School, to teach history. Like many history teachers in Macao, Lam soon found himself frustrated by the lack of locally oriented teaching materials.
大學畢業後，林發欽回到母校培道中學任教，跟許多澳門的歷史教師一樣，沒有本土觀點的歷史課程讓林發欽教起來備感困難。