https://www.mangago.me/read-manga/ellin_s_solhwa/
https://www.mangago.me/read-manga/i_m_a_martial_art_villainess_but_i_m_the_strongest/
https://www.mangago.me/read-manga/for_my_abandoned_love/
https://www.mangago.me/read-manga/the_one_within_the_villainess/
List of long hair men: https://www.mangago.me/home/mangalist/3068723/?filter=&page=1
Straight, bl, no romance stories included.
https://www.mangago.me/read-manga/concubine_walkthrough/
https://www.mangago.me/read-manga/another_typical_fantasy_romance/
https://www.mangago.me/read-manga/the_moon_on_the_cliff_19/
https://www.mangago.me/read-manga/heeran_love_song/
https://www.mangago.me/read-manga/the_savior_s_book_caf_in_another_world/
https://www.mangago.me/read-manga/fall_in_love_false_angels/
https://www.mangago.me/read-manga/maou_no_migiude_ni_nattanode_gensaku_kaiaku_shimasu/
https://www.mangago.me/read-manga/kanata_kara/
https://www.mangago.me/read-manga/mokrin/
I’m not sure if this one counts since he only had long hair for a short period of time
The Savior's Book Café in Another World
Gobbling the Goblin
Tokyo LACKs
Dragon Sitter
Kanata Kara
Wrapping up the Imperial Harem
Oni no Hana Sagashi
A Kind Goblin's Bird
Please, I need recommendations! Smutty or not, all are welcomed