The COVID-19 global pandemic continues, and in Hong Kong numerous measures have been put in place to contain the spread of the coronavirus. One of the many facets of life that is being affected is education, with many face-to-face classes suspended and students having to go online for lessons. The virus continues to be active in the city, so our usual way of assisting secondary school students' character-building through visitation to elderly homes is restricted. Now we can only provide such service-learning in online mode. This paper explores how an online project helped adolescents in a boys' secondary school apply and adapt principles taught previously in their course dealing with positive character strengths such as kindness, love, social intelligence, gratitude, teamwork, and perseverance.