Transmigrated into Oxygen Element

After waking up with one move, he actually traveled through time and became an oxygen element! Fortunately, Lei Cheng is in this field and graduated in biology, but the tasks given by the system are too boring—— Poisoning the princess, rescuing the princess... Each one is life-threatening! However, Lei Cheng also realized his own strength step by step, and the moment to change his fate against the will of heaven... Has arrived! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.