"We will achieve what is left to do," wrote one.
The death of the woman – known to most of the world under her surname Mak – was the fourth suspected suicide prompted by local media to ongoing demonstrations, initially triggered by a controversial extradition law many feared that it could further restrict the freedoms in the semi-autonomous city.
The demonstrators talked about victims, hopelessness and a loss of confidence in their leaders. The four deceased have established themselves in the art of protest and have been treated by some demonstrators as heroes of the cause.
The Battle for Hong Kong
The movement to block the extradition law was considered from the start as a binary struggle for life or death.
When at least hundreds of thousands marched in early June, through some measures up to a million, activists called this a "last chance to fight for Hong Kong."
The death of the demonstrators has only contributed to this intensity.
Demonstrators made banners of yellow raincoats and gave the illusion that the first suicide bomber, a 35-year-old man who died in a striking yellow raincoat, was hovering above them. The demonstrators wore black and waved black flags to honor the dead. Some demonstrators pointed to the government. For a while, a blood-red poster was omnipresent. It read, "Stop killing us."
"He sacrificed a lot for us," said a 16-year-old schoolgirl, who just called her name Athena, about the man on one of the marches. "This is related to the political system of Hong Kong – it is life threatening and fateful."
In places in the city, demonstrators held memorial sites for the dead. They stacked flowers on footpaths that formed small white and sculpted mountains, leaving notes to the dead that they would never read.
"Dear hero, we will fight for you", one read on a piece of white paper decorated with a heart. "He was pulled down by the regime," says another article.
Those who died by suicide also became institutions of protest art. One showed the 35-year-old man and another victim holding hands as they approached the light with the words, "Friend, do not go, Hong Kong, do not give up." Even messages that the demonstrators did not represent took on a darker tone. "When we burn, burn with us," read a huge, deep red banner.
"We have to remind them that it's not worth it, time is always on the side of the boys," she said. The problem is that the boys do not necessarily feel that way.
Why it's Getting Dark
Hong Kong is a city that's familiar with protests. But the protests were not always like this movement.
Hope was in the air.
There was a feeling that democracy could finally be possible.
When the protesters took to the streets earlier this year, they released scientists at Lingnan University in Hong Kong, according to Samson Yuen, a politician, years of repressed anger and distrust of the government.
The four alleged suicides added another emotional element – especially because many saw death as the guilt of the government, Yuen said.
"The protest is about Hong Kong's life and death," he said. "The protests are about continuing the wishes of those who gave their lives."
"It's about how people trust the system and how people can still have confidence in the future of Hong Kong."
At a press conference earlier this month, Hong Kong leader Lam said she was saddened by the demonstrators who had violated the bill itself. She added that the government has asked many non-governmental organizations to provide emotional counseling services "in the hope of alleviating the negative emotions that plague society in Hong Kong."
A 34-year-old protester who asked not to be named, said he had joined the protests after seeing the "brutal" police ac on June 12 – and received "faith and courage" by the death of the first protester on 15 June.
"The death of the (the protester) forced people to recognize the government of our city has changed," he said. "Our impression of a government that cares about the people is shaken."
"We have decided to ignore for years that our city is slowly changing, but this time we can not."
A hopeless future?
The bleak language – and the speed of deaths – has worried lawmakers and mental health professionals.
Paul Yip, director of the Hong Kong Jockey Club Center for Suicide Research and Prevention (CSRP), was concerned about the risk of counterfeit suicides and the potential negative impact of the atmosphere on adolescents with pre-existing mental health problems.
Yip warned that the transformation of people who may have had mental health problems into martyrs could bring with them the risk of suicide, which could have an infectious effect.
"These people … are the victims of a psychologically stressed environment," he said.
And there are indications that mental health in the city has had a negative impact on the protests. Clarence Tsang, managing director of Samaritan's Befrienders Hong Kong, said his organization received 73 phone calls from people worried about the social movement in June, compared to just a handful in recent months.
In so-called Lennon Walls in the city, protesters wrote notes on post-its that spurred each other on. "Dear Hong Kong, everything will be fine," it says in one.
Yong Pui-tung, the 28-year-old best friend of Mak, said others should have more talk and not feel alone.
I do not want that to happen again, "she said," We should all talk more with our friends – you should not feel lonely because everyone is with us.
"Hong Kong people, we stand as one and we should stay strong."
Kwong meanwhile urged protesters who think of the future, which he did not believe was as negative as many had expected.
"I think people need to keep a normal, calm attitude," he said. "You must know this is a constant battle."
Contributions: Stephy Chung from CNN, Maisy Mok, Jessie Yeung, Jadyn Sham and Charmaine Le We contributed to this report from Hong Kong.