Having concluded his "Let It Go" promotions last week, Heo Young Saeng has now released a MV for his ballad track "Rainy Heart" on June 23rd. "Rainy Heart" is a medium-tempo ballad which emphasizes a calm melody and a melodious guitar, along with lyrics that express Heo's vocal talents and features the rap of SS501 member Kim Kyu Jong. Check out the music video below, which also stars actress Park Chae Kyung! Tip: rach