Among the original methods of Korean performance culture is a form called Chuimsae, which synchronizes the audience and performers. Chuimsae is a form in which the audience becomes a performer and actively interferes with the performance. Sometimes, the degree of intervention is so strong that it changes the atmosphere of the performance in a different direction. From the perspective of Western performance culture, performers and audiences are completely separated. However, in Korean performance culture, the boundary is ambiguous. We created content in the form of an online performance using the Unity game engine and motion recognition technology. This may be similar to a video game. The Unity engine processes the audience’s common movements, such as keyboard input and mouse input, as well as gaze analysis using a facial recognition algorithm, enabling interaction with a new input system. The performance was produced in the form of an arrangement of Jeokbyeokga, a traditional Korean music, using digital instruments. Just like the episode in Netflix’s Black Mirror where the plot changes depending on the user’s choices, the performance we created actively implements Chuimsae online, inserting a free element that allows the audience to watch a different performance each time depending on the audience’s gaze and actions, thereby increasing the audience’s attention. We sought to observe the impact of the intervention on the content of the performance.