You have two lives and a neutral...
SO
SWITCH/TIMER - LIVE---------------------------------------------LS
LIVE----------------------------------------------------------------L
Neutral------------------------------------------------------------N
Ground--------------------------------------------------------------Somehwere there is probably a screw on the metal that you can ground to.
Manufacturers like this have two types of fans, a switched live and a regular fan. Honestly you probably wanted the regular model but may have bought it because it said timer/switched fan. What that is for in applications like a bathroom exhaust fan or HVAC fan, where you have a second live signal coming from a switched source. So the LS is still a live wire, it is just meant to be for a switch. Their normal model doesn't have LS, just L/N.
It is meant for something like this
(Sorry just used paint real quick)
View attachment 4769177
A lot of times you may have a light switch that ties off on the switched live and goes to a light at the same time, or a thermostat or timer that cuts the fan on and off using the switched live leg.