![](http://1.bp.blogspot.com/-RuigkbAizLg/TZBwETfd-8I/AAAAAAAAXM0/-zrJZLMrS2o/s400/4minute%2Breveals%2B%25E2%2580%259CHeart%2Bto%2BHeart%25E2%2580%259D%2BMV%2Bteaser%2Bstarring%2BCNBLUE%25E2%2580%2599s%2BJungshin.jpg)
The title track is called “Heart to Heart“, and the MV teaser hints at a sweet turned sour relationship between member HyunA and bad boy CNBLUE’s Jungshin.
It’s a short prelude of what’s to come before the full song gets released on March 29th.
![](http://3.bp.blogspot.com/-Qjot59EBuqc/TZBwEKkopiI/AAAAAAAAXMs/bQ4NDnoxUUI/s400/4minute%2Breveals%2B%25E2%2580%259CHeart%2Bto%2BHeart%25E2%2580%259D%2BMV%2Bteaser%2Bstarring%2BCNBLUE%25E2%2580%2599s%2BJungshin%2B%2B2.jpg)
source: allkpop