Heart-Pounding Planet Manhwa
두근두근 플래닛

After Jieun learns that Seungjo, the person she has loved unrequitedly since high school, has a girlfriend, she looks for somewhere to express her hurt. She finds a chat app called Heart-Pounding Planet and meets someone using the name “Jemulpo Puppy,” leading to a brief fling. When winter break ends, Jieun returns to school after an absence and is stunned to come face-to-face with Jemulpo Puppy—the person she thought she would never see again. “I found you, little pebble.”