In September 2022, Angel launched her first self-published book: non-completion (《肄業》). The book serves as a delayed response to the unanswered questions left in the classroom, haunting Angel ever since her university graduation. Everything first began in note-taking apps and Instagram, but the project has only taken shape when the materiality of printed books gives weight to personal memories and emotions.
肄業，意即修學中而尚未畢業，也指各就其業，或沒有完成畢業要求便退學。
畢業證書收到了，但功課還是欠交。未完成的課題是調配出自己的顏色，並藉此看見他人的顏色，看見異同。
作者以「慘綠」和「赤子」兩詞的色調作聯想，寫下年少的脆弱與銳利、疏離與熱情，希望借茲滋養芽肄，尋找來年的新課業。《肄業》收錄共四十四篇，沒有以任何文體作為寫作出發點或目的地的作品，部分曾發表於Instagram (@ambiguity_y)，另附四幅彩色插畫。
設有「慘綠」及「赤子」兩款封面，內容無異。
94pp | 128 x 182mm | blind deboss on cover, digital & offset print, perfect binding | limited edition of 80 copies
Also available at ACO Books, Jisaam Books 貳叄書房 (Yau Ma Tei shop) and ZINE COOP online shop.