After a summer of being tear gassed, can Hong Kong protesters go back to being students?

(CNN)Welcome signs, colorful banners and campus maps are plastered over Hong Kong's colleges and high schools.

It's the first week of school, but there's one problem -- thousands of students are missing from the classrooms.
At 10 of the city's 13 universities, students are staging a class boycott, and student union leaders estimate that more than 100 secondary schools also planned class strikes.
    It's the latest move in pro-democracy protests that have rocked Hong Kong for the past three months, and the students say it will continue until the government responds to all of their five core demands. So far, Hong Kong Chief Executive Carrie Lam has acquiesced to one: the full withdrawal of the bill that would have allowed extradition to mainland China, and which sparked the protests in June.
    Hong Kong protesters' 5 demands

    1. Fully withdraw the extradition bill
    2. Set up an independent inquiry to probe police brutality
    3. Withdraw the characterization of protests as "riots"
    4. Release those arrested at protests
    5. Implement universal suffrage in Hong Kong

    While the demonstrations have spanned all demographics, young people have become the face of the movement, and some have been at the most violent, extreme end of the clashes. More than 1,100 protesters have been arrested this summer -- one 13-year-old was arrested for being in possession of two petrol bombs, police say.
    Now students are going through the motions of starting a new school year, buying books and registering for classes. It's a familiar routine, but nothing about it feels normal.
    "The city is dying," said Kris Fan, a 17-year-old high-school student. "We can't just sit here and read our books. That's no use. I think the city is more important than our academics."
    Students at Ying Wa College in Hong Kong boycotted classes and the school year opening ceremony on September 2, 2019.
    After a summer holiday defined by tear gas, political activism, and the worst political crisis Hong Kong has seen in decades, many young people say they simply can't return to normal student life.

    One summer can change everything

    When 21-year-old Davin Kenneth Wong watched the science fiction television show "Stranger Things" with his friends last month, he was struck by its parallels with his own life.
    In the Netflix show, a band of rebellious kids (plus one with superpowers) do battle against otherworldly monsters to save their hometown. "One summer can change everything," the trailer said.
    "We totally feel that," said Wong, president of Hong Kong University's Student Union (HKUSU). "This summer really changed everything. We were fighting real-life 'Stranger Things' -- but instead of fighting something from another dimension, we're fighting the police."
    Usually, students spend their summers hanging out with their friends, going to the beach, and resting up. Instead, this summer they transformed into seasoned protest veterans, strapping on gas masks and hard hats.
    Students boycott classes at the Chinese University of Hong Kong on September 2, 2019.
    Student unions helped from the sidelines, encouraging students to attend large rallies. Hong Kong University's union also engaged lawyers to provide assistance to arrested students, Wong said. Law students offered protesters legal advice, and medical undergrads volunteered as frontline medics.
    In some ways, we've seen this before -- student activism has a long history in Hong Kong.
    In 1989, thousands of the city's college and high school students staged rallies to support students protesting in Beijing's Tiananmen Square before the crackdown. The Hong Kong Federation of Students, a cross-college students' union, held fundraisers in support of their mainland counterparts' fight for democracy.
    Students struck again in 2003 and 2012, blocking legislation they felt gave Beijing too much power. But Hong Kong's young people were truly catapulted onto the global stage during the 2014 Umbrella Revolution. Protest figureheads like Joshua Wong, then just 17 years old, were depicted worldwide as teenage revolutionaries.
    Students take part in a school boycott rally on September 2, 2019, in Hong Kong.