The movie revolves around Hari (Siju Wilson), a Civil Engineering graduate. The story develops around funny incidents that occur in connection with Haris wedding. Happy Wedding begins with Hari, Manu (Sharafudheen) and Achayan (Sudhi Koppa) going to a mall where Hari proposes to Lakshmi (Delna) and she avoids him. Being upset by the sudden turn of events, Hari and Manu go to a beer and wine parlour where they meet a stranger (Soubin Shahir) who they call Bhai. Bhai introduces himself as a motivational speaker and convinces them that he will help Hari in the matters of the heart. Watch Happy Wedding to find out what unfolds next.