Fate in the Dark ~ 457 (InHun)

A twenty-year-old Seong Gi-hun, newly divorced, struggles to care for his newborn baby alone in his car in Seoul

What will happen when Hwang In-ho, the newly appointed Frontman of the games, stumbles upon the pretty, mysterious young man and his baby in an empty parking lot and decides to take them in?

or

a younger Gihun/Inho AU in which Gihun is running from his past life and runs into the rich man
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All credit goes to original author on Ao3: @merxthur