Everyone has a golden finger, and I can copy

Mo Nan came to a magical world, where everyone has a golden finger that only the protagonist of a novel has. Some people awakened the system, and with a "ding" sound, gods and demons could not stop them. Some people have unparalleled comprehension, some have top qualifications; some have heaven-defying skills, and some have the ring grandfather... When Mo Nan found out that he could copy other people's golden fingers, he smiled. Are you ready to be harvested? Geniuses?