In Chinese culture, `辈子` is a concept that extends beyond a single, linear existence. It's deeply intertwined with Buddhist and folk beliefs about fate (命运, mìngyùn) and reincarnation (轮回, lúnhuí). This is why phrases for “past life” (`上辈子`, shàngbèizi) and “next life” (`下辈子`, xiàbèizi) are so common in everyday language, even among people who aren't religious. They are used metaphorically to explain strong connections, inexplicable misfortunes, or deep gratitude.