Wong participated in the 2014 Hong Kong protests which is often dubbed the "Umbrella Revolution". Wong witnessed use of excessive violence by the police on unarmed citizens during the protests. Wong believes use of force is justified to prevent violence from police. After the protests, he formed Hong Kong Indigenous, a localist group, with other young protesters he met in Mong Kok who shared disappointment at the failure of the protests and disaffection with its leaders. Hong Kong Indigenous continued to organise and participate in other social movements, notably the anti-parallel trading protests in 2015, including the "Liberate Sheung Shui" on 24 January, "Liberate Tuen Mun" on 8 February and "Liberate Yuen Long" on 1 March. He was arrested five times in relation to those protests. Wong states that he is anti-Mainland immigrant and that the influx of mainland immigrants is undermining Hong Kong culture and abusing the Hong Kong welfare system. He has also stated, however, that he would regard an immigrant as a Hongkonger if he is willing to defend Hong Kong, its culture and values. Wong also advocates for Hong Kong's right to self-determination, and is viewed as a separatist by the pro-Beijing camp.
Mong Kok conflict
In the Mong Kok civil unrest on Chinese New Year's Day 2016, Wong took an active role as Hong Kong Indigenous called for actions online to protect street hawkers from law enforcement officials. The protests turned into violent clashes. After the clashes, he posted a recording online saying that he was unsure what will happen to him, and it might be his “final message”. He called Hong Kong people to continue protesting and make a difference, and concluded by quoting a Chinese saying: "Rather be a shattered vessel of jade than an unbroken piece of pottery." On 11 February, police raided Wong's home in Tseung Kwan O but did not find him there. Subsequently, Wong disappeared from all media contact. He was arrested at a friend's residence in Tin Shui Wai on 22 February and charged the next day with riot and, on 28 June, with incitement to unlawful assembly and incitement to riot. He was charged for instigating riot, joint incitement and inciting others to take part in an unlawful assembly.
Protection in Europe
In November 2017, Wong failed to report to the police and return his travel documents to the court on 22 November after a judge-approved trip to Europe on condition of a HK$100,000 cash bail. The High Court issued an arrest warrant. Wong was granted refugee protection in Germany in May 2018 together with Alan Li Tung-sing at a time when Hong Kong's protection for free speech and assembly and fair trials have diminished. Germany offers refugee protection to those being persecuted because of nationality, religion, political opinion or for belonging to a certain social group. He is the first British national granted asylum in the European Union.