Cognitive service using artificial intelligence is now easy to be used and implemented in programs. At the same time, robots are also as cheap as a notebook. Thus, we can adopt a robot in a classroom to help students learn. In this paper, we introduce a novel methodology to adopt a robot in a classroom to help students learn English as a Second Language (ESL). We build a digital theater first. The digital theater allows students to learn by performing dramatic act according to the script designed by the students themselves. The robot is designed as an actor or host in the drama-based Digital Learning Theater (DILT). The team listed the design consideration of the robot and describes how to implement the robot. This system was taken to a junior high school to conduct experiments. The experiment was to validate the betterment of students’ learning by using robot in DILT environment.