Named After the Month

Is There a Heroine Who Is Just Playing Around, but the Hero Takes It Seriously and Turns Evil in the End?

The heroine goes abroad or disappears after having fun, and when she comes back later, the hero keeps begging to get back together, but the heroine doesn't agree. The hero can do anything. The heroine is cold and heartless, so don't be a silly and sweet heroine! ! You can also wear books, it is best to start from the campus!!