Memorist Temporada 1 Episódio 13

Sun Mi finds out that Dong Baek was at the scene of the mass murder in Shimbae City 20 years ago. However, she decides to continue with the joint investigation after a brief interrogation at Jin Jae Gyus house. Eventually, Sun Mi and Dong Baek realize what the Erasers ultimate goal is as they finally face those behind the grand scheme.