It sounds like you are looking for a high-quality download of Zhang Yimou’s 2018 film in 1080p BDRemux MKV format.
A "BDRemux" is the highest quality 1080p version available because it strips the menus and extras from the original Blu-ray disc but keeps the video and audio streams to the source, without additional compression. Why this format is preferred for Shadow :
: The film uses a unique "Chinese ink wash painting" aesthetic with a nearly monochromatic palette. A Remux ensures the deep blacks and subtle gray gradients are preserved without "banding" or compression artifacts found in smaller encodes.