So basically Mc is an office worker gets teleported to another world meets the ml who is an older man with shorthair but with a ponytail has an eyepatch gets told that the Demon king or whoever the bad guy is is corrupting the world but only he can save it with his yin energy which is basically erotism/ sexual energy so he goes around the world “training” his yin(intercourse) and once ready he confronts the demon king or whoever but finds out it was his coworker who was in love with him who researched his whole life to find mc and developed teleportation to get to him only to end up in the past before the point of mc arriving. depression hits and it corrupts him turning him, the ml is a clone of the coworker he created to help the mc once he arrived
So basically Mc is an office worker gets teleported to another world meets the ml who is an older man with shorthair but with a ponytail has an eyepatch gets told that the Demon king or whoever the bad guy is is corrupting the world but only he can save it with his yin energy which is basically erotism/ sexual energy so he goes around the world “training” his yin(intercourse) and once ready he confronts the demon king or whoever but finds out it was his coworker who was in love with him who researched his whole life to find mc and developed teleportation to get to him only to end up in the past before the point of mc arriving. depression hits and it corrupts him turning him, the ml is a clone of the coworker he created to help the mc once he arrived