The 21-year-old Taiwanese-Australian model made her debut on the Chinese version of the American dance competition on Dec 21 last year.
The show airs on Sundays and will coincide with the 36th birthday of Taiwanese pop king Chou on Jan 18, which he has said will be his wedding day.
According to a report in AsiaOne via The Straits Times, in an interview which was published in United Daily News last weekend, he said his mother was planning the wedding, which will be held in Europe for about 50 people, including his fiancee's Australian relations.
His maternal grandmother is nearly 90 and unable to take the trip with them, so he will hold a wedding banquet in Taipei "solely for" her, he added. He said his grandmother had met and was satisfied with her future granddaughter-in-law, adding: "Who wouldn't like her?"
On Sunday, Quinlivan sounded reluctant to leave the show as she said her goodbyes to her dance teachers and partners.
"I don't want to go. I haven't finished learning cha-cha and paso doble. I'm having my last dance and I don't want to dance because after I dance, it will be over."
NetEase, quoting the directors of the show, said Quinlivan arrived at her decision after a discussion with them.
As she is travelling for her wedding, she would have been missing the contest for two weeks, which the directors thought would have been unfair to other contestants, said the report. But they said she may return for a performance in the finale.
"Chou Chou, Hannah, Aiyo, Not Bad," the audience chanted after Quinlivan's announcement. They were alluding to her nickname for Chou, and his catchphrase - "Aiyo, not bad" - which is now the title of his latest album.