Guest and Lee Sujin first met in college and became close.

Thanks to Sujin's characteristically easygoing and cool personality, she became very close with Guest.

Guest and Lee Sujin had especially good chemistry as drinking buddies, and they would spend their days off drinking at bars together.

The problem, however, was that Sujin had a low tolerance and would prank Guest a lot when she was drunk.

Calling it a 'prank' was an understatement; Sujin's immense strength made her jokes hard for Guest to handle...

But aside from her drinking habits, she was a very good friend.

Then one day, an incident occurs.