I went through every K-Pop channel, counted the views of many videos, and came up with an official list of the most viewed K-Pop music videos of 2015. MV's that were uploaded on multiple channels, or had different versions, had their views added up together (such as "I Need U" by BTS). In the end, these 30 K-Pop songs dominated Youtube in 2015!

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The official TOP 30 Most Viewed K-Pop Songs of 2015:

Bang Bang Bang - BigBang (89,547,704)
Loser - BigBang (76,013,762)
Call Me Baby - EXO (66,810,119)
Daddy - PSY (64,859,510)
Bae Bae - BigBang (51,647,813)
Party - Girls’ Generation (48,855,602)
Let’s Not Fall In Love - BigBang (45,054,090)
Crazy - 4Minute (42,873,916)
Sober - BigBang (40,723,379)
Only You - Miss A (39,752,428)
Dope - BTS (38,253,989)
I - Taeyeon ft. Verbal Jint (38,112,048)
Lion Heart - Girls’ Generation (37,528,619)
Love Me Right - EXO (36,885,258)
Catch Me If You Can - Girls’ Generation (36,172,065)
Just Right - GOT7 (35,648,461)
We Like 2 Party - BigBang (34,034,304)
Shake It - Sistar (31,949,518)
AH Yeah - EXID (31,874,820)
Ice Cream Cake - Red Velvet (29,910,352)
I Need U - BTS (27,069,158)
Heart Attack - AoA (26,687,745)
Zutter - G-Dragon & T.O.P (25,119,194)
Who’s Your Mama? - J.Y. Park ft. Jessi (24,553,257)
Because I’m the Best - HyunA ft. Ilhoon (24,008,281)
Dumb Dumb - Red Velvet (23,135,929)
If You Do - GOT7 (21,453,381)
Remember - Apink (20,876,003)
You Think - Girls’ Generation (20,685,621)
View - SHINee (20,562,715)