Yoon So-hee

Yoon Hae-seon / Na Hae-won

Im Bo-mi: a coma ghost who feels pressured by her mother to be a professor, Hun-gil's love interest

Sophie Ahn, a genius scientist in charge of the EcoSun Project, and Ah-reum's friend. She is the informant that Ji-Hoon is looking for early in the series.