English in Korean songs

I've been meaning to post this, but as you might already be aware, many Korean pop songs use English in their songs. Whether it be song titles, portions of the chorus.

I noticed in 2NE1's single 그리워해요 (Missing you) a lack of English words, which I actually appreciated. Not that there is anything wrong with using English words, but I found it to be refreshing not to have an English title. There are still some English words in this song, but wanted to mention this topic for food for thought. What makes the significance of English words in a K-pop song? Is it to relate to the world fans? Is it to add a 'cool or hip' factor to the songs? I remember also this was an interesting phenom with Korean dramas, in particular with the titles of the dramas. In the past, many of the K-dramas were Konglish or just straight English (i.e. Full House, My Girl, ect) but some criticized this because it wasn't "Korean". In particular, as K-dramas and K-pop got increasingly popular in the world, that the English names weren't representing and spreading Korean culture by using the Korean language.

The music video for 2NE1 is below: