[Zhangamiddleagedmanstrugglingwithadeadendjobasaninsurancesalesperson,onthevergeofdivorcewithhiswife,losingcustodyofherdaughterandontopofallthishehadtotakecareofhisfatherwho'ssufferingAlzheimer's.UnknowinglyZhangwasinvitedtojoinanundergroundfightinggameforfinancialpurposesbuteventuallyZhangbecomeshookedonthefights...]