tbh i think the author did a pretty good job for making a hated character turned into a character that people adored more than the main character. I really want to see a continuation of the side couple but I doubt she'd make a sequel since people been harassing her on X and throwing hate for making a realistic ending :( even if you didn't like the ending, please don't harass the author. Just accept the ending as it is and move on. Don't be the reason for someone to stop making manhwa.
Yaoi manga with time travel?
http://www.mangago.zone/read-manga/bokura_wa_nando_mo_koi_o_suru/
http://www.mangago.zone/read-manga/gyangu_no_kai_kata/ this one is kinda time travel kinda from a different country
http://www.mangago.zone/read-manga/as_you_wish_seoho/ this is a shounen ai manhwa but it's good minus the abrupt ending
It's been years. Please someone translate this ╥﹏╥