Candidates Lee Cheuk-yan and Frederick Fung Kin-kee had a tense handshake when they ran into each other at a Sham Shui Po restaurant while campaigning.
The pan-democrat camp had turned hostile after Fung withdrew from the Association for Democracy and People's Livelihood he founded and joined the by-election. Fung had been criticizing the camp as anti-democratic for not holding a primary for the candidacy.
Lee and Fung ran into each other in Wonder Land Seafood Restaurant in Shek Kip Mei yesterday morning. They shook hands though Fung appeared stressed.
Fung said he could provide another choice for youngsters so that they do not have to make any compromises.
"Some people restrained from voting with tears or cast blank votes with tears the last time, and with Fung, they might think Fung can represent them," he said.
There was also a chippy scene outside the MTR Whampoa Station when a war of words broke out between Demosisto activist Joshua Wong Chi-fung and lawmaker Ann Chiang Lai-wan as they campaigned for Lee and Chan respectively.
Wong said Chiang should be held responsible for a noisy Legislative Council and that Chan would become "a second Chiang in office" if she won.
Chiang mocked Wong for causing trouble instead of finishing his university studies.
Another candidate, Ng Dick-hay, had an unusual campaign day.
He went to the graveyard in Chai Wan to pay homage to his parents before going to Mong Kok to campaign.
Candidate Judy Tzeng Li-wen distributed leaflets to her neighbors in Mei Foo Sun Chuen dressed in her favorite red clothes.
Not many residents, however, accepted her leaflets.
Meanwhile, Chan was under fire for keeping a big part of her itinerary a secret - except to a selected few media outlets.
For example, many were only told about her appearance in Whampoa yesterday morning.
Her team also told a select few reporters that she would arrive an hour late at a polling station in Kowloon Tong.
Chan denied that she had treated various media differently, and that she had informed the media about the updated schedule as soon as possible.
He filed a lawsuit claiming the election was invalid and sought to overturn the result.
Taipei District Court ruled Ting will have to pay a cash deposit of NT$4.28 million (HK$1.08 million) within a day to move the recounting procedure forward.
Ko said he did not see any illegal or abnormal situations in the whole election process, but he respected the right of citizens to file a legal challenge. He admitted his slim victory was not as expected and his team will review its performance.
According to Taiwan regulations, if the vote difference between the winning candidate and runner-up is within 0.3 percent, the runner-up can seek a recount.
The ruling Democratic Progressive Party suffered a massive loss in city and county seats, prompting President Tsai Ing-wen to resign as party leader and sparking questions over whether she will be able to run for reelection in 2020.
The Beijing-friendly main opposition Kuomintang made gains in the face of China's increasing pressure on the island.
The DPP lost the mayoral election to the Nationalist party in the southern port city of Kaohsiung - where it had held power for 20 years - after Chen Chi-mai offered his congratulations to Han Kuo-yu. The Nationalists also defeated the DPP in the central city of Taichung, where mayor Lin Chia-lung conceded defeat to Lu Shiow-yen.
Observers said the DPP's shock defeat in local polls was an indictment of policies they felt had not helped ordinary people.
Although GDP is rising in Taiwan, voters say they are not seeing the benefits and many have been incensed by cuts to pensions and public holidays.
Kerry Brown, professor of Chinese Studies at King's College London, said: "This is not a wholehearted endorsement of anyone else - just a sign of how much like other countries Taiwan now is - divided, very frustrated and looking to protest."