This study examines how Melody, a Korean transnational girl in the US, participates in high school AP (Advanced Placement) biology class, engages in identity work, and learns science. Melody was a daughter of a gireogi family (a transnational family separated for educational purposes), living with her mother and brother in the US. The recent increase of transnational educational migration among Asian students and the importance of identity in understanding students' learning and participation motivated this study. I define identity as a type of personhood and view that it is always performed and negotiated by individuals in their social lives. Drawing on ethnographic data collected in Melody's AP Biology class, I will show Melody constructed identities as a non-participant, limited English-proficient student and incompetent biology learner. Her identity construction was influenced by the meso level contexts (e.g., school, classroom) and personal contexts (e.g., gireogi family contexts). Yet, Melody constantly negotiated with these contexts to re-figure her identities to be more conducive to her biology learning and to enhance her classroom participation. This study demonstrates how individual students in the US, while coming from a stereotypically successful ethnic group, experience their life contexts and explore possibilities for learning and being in different ways. Implications include how researchers and teachers should pay attention to individual differences and contexts in order to better facilitate their science learning and classroom participation. I will also provide implications for education in countries that send gireogi families and transnational students.