Unforeseen natural and social disasters are increasing every year with the advent of climate change, armed conflicts, and social disruptions in the world. The Global Assessment Report (GAR2022) by the UN Office for Disaster Risk Reduction (UNDRR) revealed that 350 to 500 disasters took place every year over the past two decades. In this light, memorials are becoming increasingly important public spaces where the community can partake in the pain of the tragedy, heal from the trauma experienced by the community, and recover from the divided society to build a healthier future. This study focuses on the April 16 Memorial Exhibition Hall that commemorates the victims of the Sewol Ferry Incident of 2014. 304 among 476 on board were lost during this incident, the majority being highschool students in their teenage years. This tragedy shook the nation in its entirety, and many who witnessed the event suffered from indirect posttraumatic symptoms such as insomnia, anxiety, depression, and helplessness. An in-depth interview of five donors of artworks to this memorial hall revealed that all of them experienced positive changes as the result of their social interaction with other participants, families of victims, and visitors at the exhibition hall. Through self-disclosure and social support, the donors experienced positive changes in self-perception, life outlook, and relation to others. These changes ultimately correspond to the model of posttraumatic growth proposed by Tedeschi and Calhoun. As such, interactive memorial spaces can provide posttraumatic growth for the community that experienced trauma.