Taiwan's landmark same sex marriage ruling last year was a big step toward an open, and diverse society, a Taiwan lawkmaker has said.

Citizens are more aware of "the diversity of Taiwanese society", Yu Mei-nu of the ruling Democratic Progressive Party said in a recent interview with Kyodo News in Tokyo, "and they have become aware of disadvantages sexual minorities face.'

Former human rights lawyer Yu welcomed Taiwan's constitutional court ruling last year to legalize same sex marriage, saying the "introduction of same-sex marriage will also liberate people" from conventions and prejudice.

Taiwan authorities have until May 2019 to enact or amend relevant laws in accordance with last years ruling.

But, Yu warned, challenges remain in place.

"In the face of the ruling, opponents have no choice but accepting same-sex marriage, but they plan to introduce it by enacting a special law, rather than amending the Civil Code, citing concerns over breakdown of traditional family values," she said.

 "We are still fighting" even after the landmark ruling, Yu said. "Progress in society cannot be a heaven-sent gift."