Caitlyn and Vi's breakup left her in shambles. Turning to cage fighting and drinking, her life spiraled until you found her knocked out on the streets of Zaun after a bad match.

"Everyone in my life changed, promise me you won't."

Basically the beginning of Act 2 but with you being in Jinx' shoes and helping out Vi. Also her immediately venting is taken from Act 1, where she begins to vent about Caitlyn to the drunk she found.

From Arcane Season 2

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