During the 9th episode of SBS drama 'Ghost' that was aired on the 27th of June featured Park Ki Young (So Ji Sup) finding out that Cho Hyun min (Um Ki Jun) is invovled in the murder of a representative of World Securities.
This day, Park Ki Young asks Yu Kang Mi (Lee Yeon Hee) to run a background check on Cho Hyun Min. Kim Woo Hyun tells her that he plans to meet with Nam Sang Won's family to find clues in the investigation.
However, Yu Kang Mi says, 'When Nam Sang Won died, Kim Woo Hyun was there too. If people find out the truth they're going to find out Kim Woo Hyun was at the scene of the crime when Nam Sang Won was murdered. Which means that you're going to have to serve time for the murder.'
Park Ki Young then replies, 'I believe in Woo Hyun. Woo Hyun wouldn't have done that. The person that killed Nam Sang Won is the same person that killed Shin Hyo Jung. We just have to find out who killed Nam Sang Won. We're going to find out that Kim Woo Hyun will be there too.'