Cat

Cat is Teng Qingshan's previous wife from Earth. She was killed in a plot by the "Red" Organization in order to try to complete an S-Rank Mission.

Backstory
She was part of the orphans who were kidnapped by the "Red" Organization. She was one of the final 38 survivors who were able to get through training in Siberia. She was 1 of the 4 who went and trained under Master Teng. She was an A-rank Hitman. After she died Teng Qingshan became outraged and killed all of the A-B rank assassins of the "Red" Organization.