I was transported into an otome game: I made the heroine cry.

The game's art director transmigrates into an otome fantasy game he helped develop, becoming the female protagonist's senior brother. In this world where romance can easily lead to destruction, he has no choice but to keep the female protagonist single in order to protect himself.
"Early mornings are for Taoist magic and martial arts, midday for literature and arithmetic, and evenings for magic arrays and talismans. Ten lessons a day will give you the joy of being a senior in high school. If you still want to date, then you definitely don't have enough homework."
Female protagonist: Is this what cultivating immortality is like?

Novel keywords: Transmigrated into an Otome Game: I Made the Heroine Cry (no pop-ups), Transmigrated into an Otome Game: I Made the Heroine Cry (full text download), Transmigrated into an Otome Game: I Made the Heroine Cry (latest chapter reading)