This build is focusing on using lee sin's early damage by buying an early last whisper which i found is great damage item for lee sin.However,after buying it,his next items all should by tanky unless you want to invest in more damage.Why?Because i realised after buying the last whisper i did not need anymore more offensive items as last whisper will scale into the later game because of it's armor penatration.But it still doesnt hurt to get a bit more offensive you feel tat you dont need tankiness earlier.So overall i think this build is really good as i tried it many times in ranked or normal games already and since lee sin is one of my main junglers.Lastly,i want to add on that i do a lot of insec kicks which makes my team win the match which i love doing since it is quite a hard trick to pull off since it requires a bit of practice to perfect it,but i am not saying it is a must to do it to become a good lee sin player as i think lee has a really good ganking kit already adding on to his ultimate.Thanks for reading and good luck in your games with lee sin.