Female Sovereign World+
The male protagonist is not the male protagonist in the original world, but he is very much the key to promoting the original female protagonist's growth/repentance/repentance/understanding of her feelings and other major milestones in the original world. That is: every world he lives in is just a world where he sacrifices himself to fulfill others.
The heroine will be a flesh-and-blood, multi-faceted, real person who is also lovable.
Rather than saying that the heroine's mission is to save the male protagonist from the tragic fate of cannon fodder, it is better to say that she sincerely saves you and heals me.
Purpose: Save you and heal me