[1][2][3] He sat in the Volksraad (the colonial legislature) of the Dutch East Indies for two terms (1924 – 1929, 1938 – 1939), and was a founding member of the centre-right political party Chung Hwa Hui.
[4][2][3] Han also served as a Trustee of the Technische Hoogeschool te Bandoeng (now an Indonesian national research university, ITB: the Institut Teknologi Bandung) from 1924 until 1940.
[9][3] Together with his parliamentary colleagues H. H. Kan and Loa Sek Hie, Han was instrumental in the establishment in 1928 of Chung Hwa Hui (CHH) in the Dutch East Indies, a centre-right political party affiliated to his old student organisation in the Netherlands.
[3] With H. H. Kan as founding president, CHH became a platform for Han and his colleagues to advocate cooperation with the Dutch colonial state to achieve legal equality for ethnic Chinese subjects in the Indies.
[9][3] At the end of his tenure in the Volksraad, Han settled down in Semarang and became a deputy of the Provincial Council of Central Java (the Provincialen Raad van Midden-Java), a role he performed until his death in 1940.
[11][3] Han commissioned the prominent Delft and Paris-trained architect Liem Bwan Tjie to design their Art Deco villa in Candi, Semarang.