Barney proves to Nora that he can be a good boyfriend to her, and Robin regains feelings for Barney. Barney is forced to wear Marshall's ducky tie for a whole year after losing a bet with Lily that he can do a chef's job at Shinjitsu

YOU can take a short information from us. Just look at the below which i mentioned for you.
Name: How I Met Your Mother
Genre: Sitcom
Format: Narrative in past tense
Created by: Carter Bays, Craig Thomas
Starring:
Jason Segel
Cobie Smulders
Neil Patrick Harris
Josh Radnor
Alyson Hannigan
Production:Executive producer(s): Carter Bays, Pamela Fryman, Rob Greenberg Craig Thomas
Original run September 19, 2005 (2005-09-19) – present
Status Returning series