KBS drama Love Rain (사랑비) began airing in Mars with the final episode scheduled for end of May. Parts of the soundtrack was released on four digital singles before the full soundtrack was released on April 24th. On the full soundtrack, and also on the fourth of the singles with a release on April 17th, there was Yozoh singing a song called “자꾸자꾸”.

Sources: Hyang Music; maniadb; DramaWiki