Reborn as a Demon for You

In his last life, he was too cowardly. Although he loved her to the core, he did not stand up for her when she was in the most critical situation! By the time he mustered up the courage, it was already too late! He died and still failed to protect her! In this life, he swore that he would never let her be wronged again. God would kill a god if he stood in his way, and he would kill a Buddha if he stood in the way of a Buddha...