Strange Global Recovery

Ding… Congratulations to the host for coming of age The system is officially started "I obtained the system? And also traveled through time?" Yunfan didn't wait to ask any more questions. The world outside suddenly became dark, and the originally warm and gentle sun seemed to be exuding a chill that could be felt from the heart to the outside. Another inexplicable fear fills the entire world, and all creatures feel this fear, even if it is a non-intelligent creature, even if it does not understand fear. Fear. Horror. It's chilling. This is the author's first time writing a novel, so please give me some advice. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.