beta
"Please send me back to the past." If he cannot not kill that person in this era, he just ...
+ strong op mc
+ regressor
+ martial arts murim
+ no mercy killing / apathetic when killing
TLDR: mc meets side character that knows the art of regression and gives him a quest to obtain those items. mc obtains it but took 40 years and the two grew old together. side character finally did the spell for regression and almost betrays mc