"Notes of a Paternity Tester" tells the story of young paternity testers represented by Dong Ningshu, who face families who come for paternity tests one by one, decipher warmth in bloody cases, and stage countless Shura scenes surrounding the truth of paternity in the small paternity testing institute. This group of young people also find their own life direction in these cases, and make the most humane choices in the cruelest truth.