The photo have different colour after Lightroom

One important setting to change is in Lightroom classic's preferences to change raw defaults (in the presets tab) to 'camera settings'. This will make the default rendering after import similar to the camera generated jpeg by automatically choosing the corresponding profile and by doing a few settings that mimic the jpeg engine in the camera. This will only affect newly imported images. For already imported images, hit reset and it will do the same thing. You can also apply the 'camera settings' preset. 
note that the point of shooting raw is that you have complete editing latitude. With just a few edits, you can make your raws look far better than the in-camera jpeg. Just try the auto button, or use an adaptive profile to get some automatic edits that will immediately make your image look better.

@Klein C 

Raw files in LrC must have a Profile applied to them and invariably these give a different look than the in-camera processing that creates the camera's JPEG. The Camera Profiles in LrC have been created by Adobe to closely match the camera settings, but they are never exactly the same. If you are going to process your raw files (CR2 or DNG) in LrC, don't be overly concerned with the camera's JPEG; process your images to how you want them to look.