One is a legend from the future, a new type of fighter who does not understand emotions, and the other is a warrior who made great achievements in his previous life but ended up dead in prison.
The cavalry generals, two completely different heroes wrote their legends in the same era. This is a promise made by one time traveler to another reborn person.
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"With my power, I will protect your life, expand your territory, and protect your mountains and rivers."
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That person's protection has never been hidden from the first time we met. So, in this life... I will never let go again.