In his journey of study, young Song Ci, a forensic medical scientist in the Song Dynasty, becomes entangled in a murder case. Still inexperienced, he faces the peril of making a critical mistake. A mysterious traveler comes to his aid, unraveling vital clues hidden on a red oil paper umbrella that prove instrumental in cracking the case. Inspired by his own shortcomings, Song Ci doggedly pursues the truth, forging a legendary path as he unravels the mystery.
Two seemingly unconnected suicide cases point all suspicions to a famous painter. And just when the police locked the murderer, they found that the suspected painter had jumped to his death. The crisis does not end there. The case is in an unprecedented dilemma, and the only clue left is the suspect painter's ex-wife.