Yes, LINE already has many users in Spain and other Southeast Asia countries. KakaoTalk is launched at 2010, before the smartphone market is matured. At the first time KaKaoTalk was made, Samsung and LG (both of them are Korean tech giant) dramatically produce many Android device, but there's no wonderful messaging app. (WhatsApp is not an free model, and other messaging app's quality it not that good) After KaKaotalk have gained lots of popularity, Naver made two messaging app named NaverTalk and LINE. NaverTalk based on Korean market and they failed since KakaoTalk already occupy all the smartphone. But LINE is based on Japan and they succeed, so Naver threw out NaverTalk and focused on LINE. At this time, Daum (before merged with KaKao) made messaging app named MyPeople. They have many users in Korea, but didn't make a profit because of KaKaoTalk. And MyPeople also removed from the market after Daum merged with Kakao.

I see, thanks.

AFAIK, they simply entered the market first and gained a large user base.