"The Innocent Man" Song Joong Ki and Moon Chae Won were spotted in this behind-the-scenes shot of their 'stairway kiss.'

On Monday, the production released the making-of film on its main homepage with the title, 'The Kiss Scene Revealed: Eun Gi and Ma Ru at the Police Station.'

In the making film, Song Joong Ki almost falls backwards on the stairs while trying to figure out the blocking with Moon Chae Won but she was able to hold him and avoided an accident.

When the shooting started, Song Joong Ki almost loses balance again but catches himself and the two were able to share a very deep kiss, which excited the viewers on the October 31st episode.

On Wednesday, Moon Chae Won will exact revenge on Song Joong Ki after recovering her memory.