He and she have a common mission, but unexpectedly the gears of fate turn. After a brief separation, the love they once had is gone, and she and he are destined to become enemies.
He let her make trouble without saying why.
"As long as she thinks it is right, even if she takes my life, I will never give up."
"Very well, then go die."
Affection, enmity, love, and hatred constantly circulated between the two of them.
"Whether I love her or hate her, I have no regrets for her."
...