FINALLY a (mentally) older mc who doesn't fall for women too young for him! Although some are interested in him, he basically treats them all like kids.
A martial arts legend disappears for 20 years and then comes back younger to get revenge. Has the same age-gap-romance problem as the god of blackfield, though it is definitely only a side plot.
Doesn't hide his powers at all and his true identity gets revealed in the later chapters.
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Heavenly Grand Archive’s Young Master