But this in no way slowed Sung's promotion of the mother-tongue literature movement. When the national curriculum incorporated Taiwanese language courses in 2001, he threw himself into the composition of Taiwanese-language poetry. "Only by writing in my mother tongue can I fully control the meter and capture the feelings of the people," says Sung, who published two collections of Taiwanese poetry-A Wooden Spoon and Universal Love Song-in that same year.
但他對「母語文學運動」的推廣與堅持並未因此受阻，2001 年國民教育普遍教導母語，他更致力於台語詩的創作，「只有以母語寫詩，才能充分把握詩的韻律及民族情感。」