[4][5] In May 2016, he was appointed the deputy minister of labor,[6] and vacated his seat on the Tainan City Council to take the post.

[7] In September 2017, he left his position at the labor ministry, citing personal reasons.

[10] Kuo won the election, though he finished less than three percent ahead of his closest challenger, Kuomintang candidate Hsieh Lung-chieh [zh], in a district that has been considered a stronghold for the Democratic Progressive Party.

[13][14] He won a full legislative term in 2020,[2][3] facing Kuomintang candidate Lee Wu-lung [zh].

[15][16] On May 17, 2024, he snatched documents from Chester Chou, Secretary-General of the Legislative Yuan, and fled quickly, creating an internet meme revolving around the Taiwanese politicians spontaneous action.