Purpose: The purpose of this study was to examine the simulation learning experiences of undergraduate nursing students. It's basically meant to provide some information on how to boost their will to learn to raise their learning efficiency. Method: The collected data were analyzed by Giorgi's phenomenological analysis method. Data were gathered from October 10, 2011, to November 10, 2012, by using nonstructured and open-ended questions, by having in-depth interviews, by making an observation and by letting the students write reflective essays. Result: As a result, there appeared 4 core meanings and 11 themes 1. Expectations for new learning methods 2. Burden about role-playing activities 3. Joyful hands-on learning 4. Becoming one through cooperative learning. Conclusion: As for the stimulation learning experiences of the undergraduate nursing students, they faced pressure about role-playing activities, but started to take lessons with expectations for the new learning methods. They became one through cooperative learning and thereby experienced delightful hands-on learning. Given the findings of the study, the development of diverse learning scenarios and efficient implementation strategies is required to guarantee the efficiency of simulation learning