2027 has 68 son-eomneun days. January: 6, 7, 16, 17, 26, 27; February: 5, 6, 15, 16, 25, 26; March: 7, 16, 17, 26, 27; April: 5, 6, 15, 16, 25, 26; May: 5, 14, 15, 24, 25; June: 3, 4, 13, 14, 23, 24; July: 3, 12, 13, 22, 23; August: 1, 10, 11, 20, 21, 30, 31; September: 9, 10, 19, 20, 29; October: 8, 9, 18, 19, 28; November: 6, 7, 16, 17, 26, 27; December: 6, 7, 16, 17, 26, 27.
A day whose lunar date ends in 9 or 0. Said to be free of interfering spirits, and long the day people pick for moving house or opening a business. It has nothing to do with your birth chart.
Public holidays come from Korea Astronomy open data; the 24 solar terms are computed from solar longitude. Lunar dates and day pillars appear for every day.