Hey there, Alessa here! I've been playing League since late season 2 and I never took it seriously until season 4. I play on PH server and I'm currently in Emerald Division 1, peaking somewhere around Diamond - Masters almost any season. I play almost any role, so I can say that I'm qualified to make some guides here. Hope you learn something new from my guides. Enjoy reading!

Lee Sin is an early game nuker that can outburst most junglers early in game. Pre-6 is Lee Sin's playground as he can easily deal damage without the help of his ultimate. He's also very mobile thanks to his two gap closers that both shares a decent cooldown. Pick him if you want to apply pressure anywhere around the map without sacrificing jungle camps for ganks. Getting ahead of the enemy jungler is also one of Lee Sin's strength. You might also want to lock him in if you want to have an ally snowball and smash their lane.

Pros

+ Highly mobile + Fast camp clearing + Good ganking potential + Good early game damage

With 2 gap closers in his kit, Lee Sin makes ganking really easily and less risky. His fast camp clears thanks to his passive, Flurry are also worth notable since you would spend less time on the jungle and more time around the map. Capitalize on these advantages to try and have your laners snowball and dominate their lanes.

Cons

- High skill ceiling - Suffers when behind - Falls off late-game (when played as off-tank) - Risky plays - Energy hungry

Lee Sin's early game damage would eventually fall off if you build him as an off-tank, which is definitely the ones in this guide. Going lethality or assassin route would also make sense if you still want to be a big threat late game. Knowing when to engage and disengage is the key for a better Lee Sin game by building him off-tank. This makes him more like a utility champion that helps pick carries to try and win a team fight.