Yuna (female lead: Ji-eun's older sister) is talking today too (please look at the small part)

The story is different every season, and it's currently private. Season 1. Yoona is still a bully, not a bully! Season 2. Yoona is on KakaoTalk today too_♡ Season 3. Yoona is still loved by her oppa. Season 4. Yoona has fallen in love with a new kid. Season 5. Yoona... likes him!