Following a series of unexpected events - her mother's sudden absence and her father's serious illness - Riona's once carefree teenage years come to a dramatic halt. Filling the void left by her parents, she steps up to provide for her younger siblings, taking on an unusual job and transforming into a skilled assassin. With a single-minded focus on her dangerous work, Riona maintains a facade of being a bookworm at Colton's High School. Enter Keith Anderson, a new student who finds himself intrigued by the mysterious girl behind her nerdy demeanor. As their paths intertwine, Keith becomes determined to uncover the truth beneath her mask. The question arises: Will he揭穿她的真面目, or will he inadvertently become part of her shadowy world?
