This is a mod made by a Korean mapper. The read me is almost empty. It seems to be a remake of Half-Life! It starts with a tram ride, followed by collecting your hazard suit, then pushing the material into the test chamber and watch things go wrong.
Residual Point/Residual Life scientist models originally have the HD color palette style with brown trousers, tanned skin, and light blue shirt. Also it has shifted textures. This Moddb member PsyWarVeteran has already made a little fix for RP/RL scientist, he has adjusted faces and added gloves, but the rest of textures were still shifted and it kept the HD color palette. So i have taken this model and modified it to give the classic LD color palette style because i like it this way; paler skin, darker blue shirt and tie, white trousers. Also i have included the civ_scientist and cleansuit scientist which weren't included in PsyWarVeteran's pack. I have modified them too.
Not bad, though original LD style is not so bright.
The fourth scientist reminds me from Black Mesa Source.