Na-Eun and Pengsoo's CF for Dongwon Tuna was the most-watched CF last year.
Google chooses the top 10 CFs per country based on the number of times the ad was played on YouTube, the total amount of time it was watched, and the total amount of times people watched the ad without skipping. Out of all the ads played in Korea, the CF for Dongwon Tuna was ranked #1.
Check out the CF above. Have you seen it on YouTube?