Siyeon released poet Myung-soon Lee’s first ballad album, ‘Poet Myung-soon Lee’s Street of Wet Sentences.’ This album was introduced as music that records the process of forming emotions rather than singing about emotions directly, and was described as ‘unwritten sentences, a song of time that reads itself.’ The included songs include ‘Street of Wet Sentences’, ‘Concentric Circles’, ‘Sentence of the Wind’, and ‘One Ember, Awaken Spring’, and it is said that they focused on maintaining the sound of the wind through singles and duets, with the acoustic guitar as the main song.