Mabel, Liam and Aaron have been friends since childhood. Their bonds of friendship are tested when, years later, they realize their friendship is the only reason they have made it through emotional hardships and extreme tragedies.
University student Hsu-hao longs for love. He subscribes to the “fish pond theory”, believing that he should spend time with and compare many different girls before choosing the right one. One night, Hsu-hao comes across a girl named “Koi” on a dating app and they hit it off, but the app does not match them. As he begins searching for her, a classmate recommends that he use the “Rent a Girlfriend” service. Hsu-hao ends up having a great Valentine’s Day with a girl from the service, and despite still wanting to kind Koi, he becomes inexplicably attracted to this new girl…
Shu-wei is an unpopular student who is a constant target for the school bullies, but he ends up joining forces with them when they encounter two demonic sisters who feast on human flesh in the middle of the night. The gang manage to capture one, but the other demon is angry and starts killing anyone wearing a school uniform.
College student Stone has been a fan of supernatural phenomena since his childhood. To attract his crush to join the unpopular "Supernatural Sensor Society", he plans to stage a rescue mission. However, things get out of hand and Stone dies trying to save his crush from drowning. He meets an Underworld Guide, Lou, who made the mistake of capturing Stone's spirit and eventually resurrects him. They are transported to the Dream Pavilion, where they are forced to help the lost souls or risked being trapped in the Underworld forever.
Two teachers hold polar opposite viewpoints about teaching and life. Wang Qiang-Da is a genius Professor of Mathematics who approaches everything in front of him with logic and reasoning. Wang Qiang-Wei is a history teacher, art appraiser and “Dorothy” on “Sophie’s Midnight Sky” radio program. She cares about the love of learning and making people happy around her. Qiang-Da and Qiang-Wei are brought together during a crime bust for the “Black Ghost” which goes wrong. Both end up teaching at Chang Tai Tutorial Classes and helping Prosecutor Tie Bu-Fan solve cases.
