Lullaby (자장가, Jajangga) is chapter 3 of the Twelve Nights webtoon.
Synopsis[]
Dan Ah treats Won bottles of alcohol as compensation for helping her hide from her servants. They stay at Yeon Wol Jung where Won sings the Butterfly lullaby. Dan Ah gets surprised and cries out of joy, thinking that he is the boy she met ten years ago at Bi Hwa Rim.