The Villainess Lives Twice - Chapter 17

The Student Council President’s Secret Laid Bare (生徒会長のセキ裸ラな秘密) is fairly standard 2D Dream Bunko fare but with an exhibitionism theme.

Basically, it’s about a guy who discovers the student council president is an exhibitionist and gets roped into helping her with that fetish.

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

Synopsis ___________________ Viretta Medlit is a hopeless braggart. One day, she casually boasts to a young man she meets about her unfortunate arranged marriage, only to discover that he is her fiancé. To make matters worse, her exaggerated claims stir something within him. “Are you prepared to face any hardship?” “Of course. If it's for the one I love, I’d even hunt a dragon!” “Then let’s go hunt a dragon. And break off the engagement afterward.” Thus begins Viretta's journey to hunt a dragon… All in the name of breaking off her engagement with a fiancé she actually finds quite agreeable!

Su Chengyu took the blame for his wife and went to prison for three years. Upon release, he realized that she had betrayed him.Despite this, he benefited from misfortune and comprehended the Dao, stepping into the world of immortal cultivators. He could easily master immortal techniques and ancient martial arts. He could also refine pills, draw talismans, treat illnesses, and save people at will!Su Chengyu postured crazily in the Red Dust City, vowing to find out the truth behind the death of his 127 Su family members 26 years ago.