The Password Is 002!

The night before Sujeong plans to confess her feelings for Dojin, she runs into him on the street and is devastated to find out that he doesn't even know her name. Too afraid to face him in class the next day, Sujeong hides in the storage locker, where she meets Dojin's younger brother Jaeyun. With Jaeyun's help, will she able to win Dojin's heart?