This study investigates how affective dispositions influencing students' moral judgments can both shape their response to individual enjoyment from learning ethics (IE-LE) and predict their individual enjoyment from learning socio-scientific issues (IE-LSSI). Tenth-grade participants from southern Taiwan (n = 770) responded to survey items that support four subscales: science classroom, news media, IE-LE and IE-LSSI. Structural equation modelling analyses of these subscales found them to be empirically separable, structurally reliable and valid for investigating how students' affective and self-related cognitive responses can predict their self-evaluated state of IE-LE and IE-LSSI. Viewed from the impact contribution of science classroom and news media, learning enjoyment plays a pivotal role in igniting and sustaining students' personal attention when discussing IE-LE and IE-LSSI in the classroom. The implication of this study is that by encouraging students to think ethically about issues of science and allowing them to investigate SSI-related issues from a variety of news media sources within the classroom context, teachers can provide opportunity for students to explore science issues that may be well connected to their personal enjoyment of ethics and sense of freedom to learn within a science-related classroom environment.