Yuán-dynasty Daoist editor and Wùzhēn piān philologist, zì Tóngfù 同甫 (or Zhòngtóngfù 仲同父), hào Kōngxuánzǐ 空玄子. Active ca. 1335–1340; CBDB gives a flourished-latest year of 1335. Dài is the editor of [[KR5a0142|DZ 141 Zǐyáng zhēnrén Wùzhēn piān zhùshū]] (8 juàn, ca. 1335) and the related compilation [[KR5a0146|DZ 145 Wùzhēn piān zhùshì]] (3 juàn, postface 1336); his sustained editorial biàn 辨 (“textual investigation”) attached to [[KR5a0144|DZ 143 Sānchéng bìyào]] (1336–1337) is one of the earliest sophisticated philological dossiers in the Daozang, disentangling the genuine Wēng Bǎoguāng commentary from the corrupt circulation under Xuē Dàoguāng’s name and assembling a substantial Jīndān fǎxiàng 金丹法象 — a classified lexicon of inner-alchemy figures gathered from the Cāntóng qì and the entire Wùzhēn piān tradition. His nephew Dài Shùn 戴順 contributed a complementary postface dated 1337. Dài’s editorial work makes the Yuán Daozang the most important single witness to the WēngBǎoguāng Wùzhēn piān tradition.