Old Cases Buried in Coffins: the Seventh Suspect's Confession

"Team Chen, are you looking at that old case again?" Intern Xiao Lin came in with a cup of hot coffee, and the steam blurred his glasses. "It's been ten years and there's still no clue?" Xiao Lin put down his coffee and asked tentatively. He knew that this case was a knot in Captain Chen's heart, and he also knew that Captain Chen's old partner Li Yang died in the process of pursuing this case.