▁directed ▁by ▁Ryan ▁E gg old . ▁The ▁film ▁stars ▁Justin ▁Long , ▁Cob ie ▁Sm ul ders , ▁Ryan ▁Hans en , ▁John ▁Cho , ▁Krist en ▁Sch aal , ▁D ana ▁Del any , ▁Peter ▁Gall ag her , ▁Le a ▁Thompson ▁and ▁Luis ▁Gu zm án . ▁The ▁film ▁had ▁its ▁world ▁premi ere ▁at ▁the ▁Trib eca ▁Film ▁Festival ▁on ▁April ▁ 2 2 , ▁ 2 0 1 7 . ▁The ▁film ▁was ▁released ▁on ▁September ▁ 2 9 , ▁ 2 0 1 7 , ▁by ▁Screen ▁Media ▁Films . ▁ ▁Plot ▁Adam ▁and ▁All ison ▁were ▁college ▁sweet he arts . ▁Adam ▁is ▁heart bro ken ▁when ▁she ▁breaks ▁up ▁with ▁him , ▁then ▁finds ▁himself ▁in ▁the ▁odd ▁pred ic ament ▁of ▁being ▁a ▁" de ar ▁friend " ▁invited ▁to ▁her ▁wed ding ▁a ▁year ▁and ▁a ▁half ▁later . ▁At ▁the ▁re he ars al ▁dinner , ▁he ▁is ▁introduced ▁by ▁another ▁friend ▁as ▁the ▁gu y ▁who ▁dated ▁All ison ▁"... liter ally , ▁right ▁before ▁A aron ", ▁the ▁gro om , ▁started ▁d ating ▁her . ▁This ▁leads ▁to ▁a ▁sequence ▁of ▁events ▁that ▁eventually ▁leads ▁to ▁A aron ▁ch asing ▁after ▁him ▁during ▁the ▁reception ▁until ▁he ▁enters ▁a ▁bus ▁and ▁leaves . ▁ ▁Cast ▁▁ ▁Justin ▁Long ▁as ▁Adam ▁Cob ie ▁Sm ul ders ▁as ▁All ison ▁Ryan ▁Hans en ▁as ▁A aron ▁John ▁Cho ▁as ▁Mark ▁Krist en ▁Sch aal ▁as ▁Tal ula ▁Peter ▁Gall ag her