As everone says lee sin falls off late game but with this build you wont Why? because he is ment to be an AD caster building health items and making him tanky warmogs atmas will cuz him to fall off late game its better for pure ad with a frozen mallet and tri force to offer you tankiness but not so much Guardians angel will help you stay in a fight as lee sin you will have to initiate and stay in the fight and deal damage do not sell wriggles because it could save youre life having that one ward on you

Go 6 flat ad runes which will cause youre burst to be very high in the beginning of the game flat armor seals help you in lane if you decide to jungle itll help youre sustain

ignite for securing kills and exhaust for extra help on kills if you jungle i suggest smite and exhaust for extra ganking power flash is not needed on lee sin as he has wriggles to help him escape

if the enemy team has no crowd control grab a beserker greaves if they have auto attack dependent characters grab a ninja tabi

This build allows you to scale into late game well as tanky lee sins who build warmogs and atmas tend to fall off hard if you watch Voyboy one of the top lee sins play he usually doesnt build any major health items because of the nerf on atmas and the nerf on lee's passive this build will help him gain back his lost