Kdrama ending songs hit different 😭

Okay but why does every Kdrama OST make me emotional even after the show ends?? Just finished binge-watching 'Queen of Tears' and I can't stop humming 'Love You With All My Heart' 😭😭 BaekHyun and Kim Soo-hyun's emotional scenes were too good. What's your current favorite OST that you can't stop replaying?