Some images now being posted online and which would appear to confirm the aircraft type as being an S76:
Police officers inspect the wreckage of a helicopter which crashed in Seoul, South Korea, Saturday, Nov. 16, 2013. The helicopter belonging to the LG Group plunged to the ground on Saturday, killing the two pilots after its propeller clipped the side of a 38-story luxury apartment building. AHN YOUNG-JOON — AP Photo
Firefighters inspect the wreckage of a helicopter which crashed in Seoul, South Korea, Saturday, Nov. 16, 2013. The helicopter belonging to the LG Group plunged to the ground on Saturday, killing the two pilots after its propeller clipped the side of a 38-story luxury apartment building. AHN YOUNG-JOON — AP Photo
SEOUL, South Korea: Copter crashes into Seoul high-rise, killing 2 | World | The Bellingham Herald