Ji-eum hears the news that Seung-jo, whom she has had a crush on for a long time since high school, has gotten a girlfriend.

Wanting to pour out her wounded heart somewhere, she happens to discover the chat app and meets ‘Lovesick Puppy’, spending a short-lived escape with him.

And after winter vacation passes, she returns to school after being away for a long time.

“W-wait a minute. Why is that person here?!”

There, she comes face-to-face with ‘Lovesick Puppy’, whom she thought she would never see again…?

“Found you, Pebble.”