The film is based on the best-selling suspense novel "The Long Corridor" by Keigo Higashino. There are countless secrets hidden in the cloister pavilion mansion. After the rich merchant died of illness, a fire murder case that occurred a year ago was revealed, involving the first heir of the estate, that is, the illegitimate son of the deceased, making the distribution of the estate complicated.
Elite lawyer Qin Shi and resident homebody Yang Hua who got "married" for their own purposes unexpectedly find true love in each other. Together, they walk hand in hand towards a happy and fruitful life.