When news of EXO’s Baekhyun collaborating with K.Will on a song was announced, the internet went crazy. After all, both singers are known for their mellow vocals that can melt any hearts. Their duet, “The Day”, lived up to fans’ expectations with the right amount of angst, sadness and bittersweet feels that hit us right in the gut. But they’re not the first to get it right. Here are other notable duets in K-pop.