Loved this beautiful tale of Ren turning over a new leaf!  Your clever inclusion of Liu's 'power' tattoo worked perfectly on two levels.  To the deceased street fighter, it likely symbolized his strength and superiority against his opponents.   But through your story, the tattoo could also be taken as a sign to Ren that he had the power to change his life, to redeem his soul despite past transgressions. 

The respect that you had Ren show his former enemy, to struggle through carrying Yuan's corpse back after vowing to care for his family, was a perfect way to show his resolve in keeping to his resolutions.