Wei San, a top engineer in her past life, is reborn as an out-of-school child in a star-faring world. By picking up trash and turning waste into treasure, she finally saves enough money for school before the semester begins. She plans to become a mecha engineer, a lucrative profession closely related to her previous expertise. However, due to seeking a cheaper tuition, she mistakenly enrolls in mecha infantry training, a path filled with violence and bloodshed. Despite the unexpected turn of events, Wei San remains determined to learn and improve her skills in her free time. During a competition training period, a media interview captures the intense training of students, showcasing their hard work and dedication. Wei San's journey is one of perseverance, resourcefulness, and unexpected career changes.