Let’s get the bad out of the way first:
The Yongsa Pati Ttaelyeochiubnida series features some extremely bare-bones editing, possibly none at all, with a noticeable number of basic technical errors (e.g. missing/wrong words, wrong names, disjointed sentences). It also has a somewhat awkward conversation style and general syntax which doesn’t always flow quite right.
The actual story and characters though? Those are both remarkably engaging and more than make up for those issues.
The main things to note would be that this is absolutely an overpowered-protagonist story (albeit with them in the role of mentor; think along the lines of Kuusen Madoushi Kouhosei no Kyoukan or SukaSuka), there are no romance aspects whatsoever, and the genderswap appears to have been done solely to provide an excuse for switching to that mentorship role while also facilitating the noted lack of romance. It’s never commented on by those who knew him both before and after, and he himself barely mentions it.