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https://www.mangago.zone/read-manga/turning/
https://www.mangago.zone/read-manga/the_rogue_prince_is_secretly_an_omega/ These 2 are both omegaverse
https://www.mangago.zone/read-manga/the_fallen_duke_the_knight_who_hated_him/
https://www.mangago.zone/read-manga/sweetie_sweetie_sweetie/ And these 2 I haven't read but you can take a look to see if you like them
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If you don't mind list..
BL KOREAN WEBTOON TOC
https://www.mangago.zone/home/mangalist/2785307/
#1 link Complete Historical
#2 link ONGOING Historical
Happy Reading!
(๑•ㅂ•)و✧
Give me ur best rec for yaoi Korean historical manhwa/manhua