I've selected and resolved bad path with Irinlia, and good path with lace, but the cg bonus between them can't appear, or is there still an update between lace or irinlia? and is there any possibility from bad path to good path?
There is no way to change the path you're on with a character. The path is locked once you make the choice.
The bonus scene is unlocked when you have both characters on their bad path, or it also unlocks in the CG room when both are on the good path. I think the system doesn't trigger currently when you have mixed routes for the characters, which might be the problem you have.
