Run the game, then click [F1] to check out the controls for each character.

[ Left Click ] Shooting

[ Right Click ] Aiming

[ W/A/S/D ] Moving

[ R ] Reloading

[ F ] Interacting

[ Left Ctrl ] Sitting

[ Space/E/Q/Left Shift ] Using active skills

[ 1-5 ] Using booster

[ ESC ] Option/Stop the game

[ F1 ] Tips

[ Tab ] Monitoring

[ Enter ] Start chatting/End

[ B ] Open the combat shop