In the West and the East, heart is believed to be the place where spirituality resides. The cupid’s arrow is directed to the heart, and person who got the arrow falls in love. The heart is so emotional term, both the West and the East.
This is similarly in Korea, heart is denoting love or couple’s going out, translating with English pronunciation “하트”.
In television program which shows men and womans dating concept, they often show popping up graphics heart appears with sound. The sound is lovely and denoted as “뿅뿅” which is literally sound like pyongpyong. So, “하트 뿅뿅” is imitation of sound appearing in the television graphics, when heart symbol popping on the screen.