Trouble G

Jin-Hung has an unusual power. She can see ghosts and make them disappear with one word! One day walking on the streets, she sees a guy trying to kill himself. To stop him she runs toward him. Later she finds out that he is a ghost, but not just any ghost- her middle school crush, Shin-Yi! Shin-Yi unknowingly starts to follow Jin-Hung around her school and then they bump into another ghost- Shin-Yi's best friend Yi-Ryeong. How did they end up dead and why is Yi-Ryeong follow Jin-Hung saying that he's her guardian?