jihn is one of the funnest champions in league. he has long range damage, absurd close range damage, invisible traps, a glorious ultimate that can send enemies running in terror from its sheer damage and range, an impressive set of voicelines, and a sick trailer. jihn is one of the few champions that can hit 1000 AD realistically. this guide may help you annihilate your opponents with almost limitless damage and MS

the goal of the build is to stack two things, Ad and MS (attack damage and movement speed)
Jhin gains both AD and MS from attack speed so building attack speed will grant you a large ammount of both stats. the combined effects of these items and runes will allow you to endlessly kite or chase your enemies
note: i got the idea for the runes and items from a nb3 video but came up with the rest myself

Fleet Footwork gives you more MS and a heal, it also works well with Statikk Shiv and Rapid Firecannon

Triumph allows you to get the items you need earlier and can help you in lane due to the heal

Legend: Alacrity gives you more attack speed which works well with jihns passive

Cut Down helps a lot as 99% of enemies will have more health than you

Absolute Focus helps as you will be at full health a lot due to the abundance of heals in this build

Gathering Storm just gives you more AD as the game goes on, due to the fact that jihn is a late game champion, this will give you a disgusting amount of AD

Rapid Firecannon helps you overall due to it giving you energized stacks 25% faster and energized attacks getting increased range
Youmuu's Ghostblade gives you more ad, some CDR, and a MS boosting active
i recommend getting RF first due to it boosting Fleet Footwork

Berserker's Greaves gives you more attack speed which is good on jihn
Statikk Shiv works with Fleet Footwork and Rapid Firecannon giving your energized attacks a lot of power

Infinity Edge will give you 100% crit chance causing you damage to skyrocket and every AA to grant you movement speed (due to jihns passive)
Essence Reaver gives you mana, lots of CDR, and AD, the passive is nice to.

the basic spell i always take is Flash. this can get you into range to get off your 4th bullet usually killing your target

for you second spell you have three options
Teleportcan allow you to get back to lane quickly and can allow you to set up some plays with you ult
Ignite can allow you to finish off a target if your 4th bullet doesn't kill them
Heal can allow you to get out of some very sticky situations and can allow you to not need to recall in some situations

a great play to aid your team is to Teleport to the nearest structure or ward while a teamfight is going on and then ult in its direction this will allow you to aid in the teamfight without having to put yourself in danger as an ADC. this will surprise the enemy team as long as you tp from brush or fog of war. remember to use your traps as you roam to cover large amounts of brush with your lotus traps. this will allow your team to get some knowledge of the enemy's movements.

jihn is a mix of an ADC and an artillery mage. the only champion that i can compare him to his Varus. he has high short range damage and mediocre long range damage. his ultimate allows him to aid in a teamfight from far away, raining damage on the enemy team. his traps allow him to keep tabs on his enemies as he takes objectives and kills

A good strategy is, once you get your 4th bullet start constantly moving around (you should be doing this regardless to ensure that the enemy can't engage on you). once you have an energized attack ready sun up to the enemy ADC and AA them
this will deal massive damage due to the combination of:
your 4th bullet, Rapid Firecannon, statik shiv, and Fleet Footwork
this AA has: a heal, a massive MS boost, extra range, extra damage, bonus damage to towers, electricity that bounces to nearby units dealing damage, percent max health damage, and an automatic crit.

this guide was made for my good friend EthanIsAwsome2 a league player who has been my best friend since 1st grade. it is based off of a Nightblue3 video. i hope you have fun one shotting your enemies with this build.