Orchestra conductor Sung-jin has got it all. Not only does he have the greatest job in the world, he’s also fiddling with the cutest girl of the symphony, Soo-yeon (played by Yeo-jeong Cho, in yet another filthy rich role after PARASITE), with lots of after-hours sextet practice. But just before their planned wedding, she just disappears – leaving only a goodbye video. There’s little time to grief though as he swiftly slips in bed with Mu-ji, the mysterious replacement for Soo-yeong in the orchestra. He’s on top of the world, again! Until he finds out what really happened to his ex-girlfriend…