During an overseas mission, in order to protect his teammate "Shadow", he was forced to inject unstable "bio-tempered nano-serum". Although the enemy troops were completely wiped out, "Shadow" died in order to cover his retreat. Chen Yan's body suffered an uncontrollable metallic mutation and he was forced to retire. Following the last wish of "Shadow", he returned to the city to protect his helpless sister Lin Xiaoxiao. At the same time, he suspected that the sacrifice of "Shadow" was caused by internal leaks, and was determined to investigate secretly.
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