I Was Ready to Give Up and Wait for Death, but He Insisted I Mend the Heavens

[Not mindless wish fulfillment + infinite-flow + ancient martial arts + decisive killings + morally ambiguous + fiery action] The cold and severe male lead, Lu Yanzhao, is trained by a grandmaster of ancient martial arts, yet is abducted and taken to northern Myanmar! After escaping, he drifts through Southeast Asia's underground boxing circuit, only to develop the terminal illness ALS! Then the [Selectors] choose him to become an Agent of Karma. He begins traveling through different eras and spaces, reversing karma and repairing the Way of Heaven!