Rebirth of the Film Emperor's Beloved Wife - Chapter 71.1 - This is Love

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

- Description from Novelupdates

He was on his way to buy some beer to celebrate his acceptance as a civil servant when he was suddenly isekai’d by truck-kun.

Kōdo Ikusei Senior High School, a leading prestigious school with state-of-the-art facilities where nearly 100% of students go on to university or find employment. The students there have the freedom to wear any hairstyle and bring any personal effects they desire. Kōdo Ikusei is a paradise-like school, but the truth is that only the most superior of students receive favorable treatment.

The protagonist Kiyotaka Ayanokōji is a student of D-class, which is where the school dumps its “inferior” students in order to ridicule them. For a certain reason, Kiyotaka was careless on his entrance examination, and was put in D-class. After meeting Suzune Horikita and Kikyō Kushida, two other students in his class, Kiyotaka’s situation begins to change.

Tian Mi, a single mother with two children, has finally gotten her life under control… that is, until a handsome VIP at the hotel where she works claims to know her and is somehow in possession of her wedding ring from her former marriage. If that wasn’t enough, her ex-husband, now a successful entrepreneur, has also shown up, and is looking to rekindle their relationship. Who is this stranger? Why has her husband returned? Will she choose new love over an old flame?