I Was Blackmailed for Saving Someone, but Luckily I Have a Regret System

What if everything could be regretted? As a street-fighting author, Cao Shuang obtained the regret system. Complete system tasks to get the number of regrets. Being blackmailed for saving someone? It's okay, I can regret it. Missed White Moonlight? Regret medicine and start walking. Missed 100 million? What's the point? I have a regret system. ······ So Cao Shuang's life as a human being began. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.