My Sister Was Killed, I Created a Monster Sequence

My sister died tragically and all my comrades were wiped out! Just because the daughter of a powerful man said "the plane is very crowded", Lin Fan, the strongest soldier, was ruthlessly abandoned by the "Salvation Army" he was loyal to and abandoned in the tide of corpses! On the verge of death, the [Savior System] is activated! System: "Host, please cheer up! Please prepare an antidote and save the common people!" Lin Fan looked at the cold body of his sister in his arms and smiled, crazy! "Save the world?" "No, I just want revenge!"