Not long after the girls debuted, Jessica and Taeyeon has been hanging around a lot.

One day, after the group's performance, everyone wanted to get back to the dorms and party. But Jessica and Taeyeon decided to go somewhere else.. Upon hearing about it Yoona flared up.

"YAH!! Why are the two of you like this?! Aren't we suppose to celebrate together?"

But Jessica and Taeyeon still insist on going somewhere else.

"The two of us are busy with something important, we would come back in time for the party. Okay?" Taeyeon lied 

Yoona felt bad for shouting at Taeyeon and Jessica, and decided to give in, she then went along with the other members to buy the foods needed for the party.

Meanwhile...

Jessica and Taeyeon were having a good time on their own, eating and playing around. The two girls were having so much fun that they didn't even know that they were already late for the party. 

Soon they arrived at their dorm's building, the TaengSic couple were still laughing heartily, but little did the two girls know that poor Yoona was just standing infront of them, waiting..

Tears could be seen in Yoona's eyes as her trust for the two girls were shattered...