"“It’s very rare that a sequel will go into (pre-)production when the first film is not even out yet. It’s 与えられた us a huge boost of confidence,” added Lily Collins, who plays the film’s heroine, Clary Fray." (c)
About four months ago, I got to visit the set of The Mortal Instruments: City of BONES(ボーンズ)-骨は語る- with a few other reporters when the production was filming in Toronto. - Collider.com