My Doppelganger Is the Protagonist's Bitch

A young lady from a poor family obtains the system and voluntarily becomes a beggar. Begging can trigger the system's reward mechanism. Joining the Son of Destiny camp will give you huge rewards. If you like it, you can help the Son of Destiny. If you don't like it, you can beat the Son of Destiny. This beggar is not poor at all, but he often sells himself into poverty~