I just had a quick look at the chinese news this morning and this is really funny. The news says that Jiwoo has committed to the film, and pretty the same information that you have translated.

However, when they asked the producer of the movie. She says that they have contacted Jiwoo but only as an enquiry. They are still in touch with Park Ji Hyun and have not committed to any contact so the casting is not final.

Well, you know HK reporters are notorious for being bad with such things. The only extra info is that the film will be shown over the chinese new year.