Kang-rim, a ghost messenger whose job is to deliver a soul, gets trapped inside his soul phone while carrying out a mission. Little Kang-rim, a boy who can see ghosts, accidentally finds the soul phone and plays with it. However, his innocent mischiefs bring about unintended outcomes, and things get out of control. Little Kang-rim releases the ghost messenger out of the soul phone, and together they embark on exciting adventures, traveling back and forth from the real world to the world of spirits.