I know my opinion might be unpopular but I wonder how it would turn out if rather than Jin running around with these professionals, he instead run around wit his high school friends punishing bullies and criminals and such. Atleast I know he and his family won't die from that because I feel like the more he's involved wit this mercenary life, the riskier grandpa and the sister lives are(〜 ̄△ ̄)〜