This series is based on the kakao webtoon Flower That Blooms at Night (밤에 피는 꽃) by Ttol-i, Jeongro, Yuna, Beth, Lee Sam, and Jeong Myung-in  (똘이,정로,유나,베스,이샘,정명인)

Official webtoon in Korean language: https://page.kakao.com/content/62265316

Unofficial webtoon in English: https://kunmanga.com/manga/flowers-that-bloom-at-night/

-----------------------------------------------If you find better unofficial versions, please link them. TY! Unfortunately Kakao doesn't have this webtoon series in English-------------------------------------------------------------------------