She will be mine

Hwang Yeji, smart, popular, gorgeous and apparently Ryujin's new target .
Shin Ryujin, known among her friends as "Shin Joanne", was winning an on going bet .
The rules are simple, you get a name, a date and an amount, and your goal is to manage to get into the person's pants before the deadline .
If you manage, you get the money, if you don't... Well that would be humiliating, wouldn't it ?
Ryujin's record however is flawless. But what happens when her friends give her a challenge named Yeji?

The story is not mine. Credits to @whoreforymir.