I'm looking for a fantasy novel (preferably Japanese or Korean) that has mutual monogamy between the protagonist and the love interest. I love fantasy novels, but I'm not a big fan of harems, which tends to be a lot of the otherwise good fantasy novels out there. I also don't want it to be super dark or have a tragic ending. I realize that I'm probably eliminating a lot of fantasy novels with this, but I would appreciate any suggestions nevertheless.
I suggest searching by romance tag while excluding harem https://www.novelupdates.com/series...&mgi=and&ge=3&tge=14992&sort=sdate&order=desc (I set it to include fantasy and romance and exclude harem). I recommend dragon wants a friend as a decent and shorter read and it’s nearly done (https://www.novelupdates.com/series/dragon-san-wants-a-friend/) this is also good https://www.novelupdates.com/series/the-principle-of-a-philosopher-by-eternal-fool-asley/ (MC is a talentless fool who accidentally gave himself eternal youth and spent millennia in a dungeon studying magic; after all if you aren’t talented just spend more time) here too (https://www.novelupdates.com/series...ance-was-just-lazing-on-the-dragon-kings-lap/) https://www.novelupdates.com/series/my-status-as-an-assassin-obviously-exceeds-the-heros/ https://www.novelupdates.com/series...llainess-but-why-did-it-turn-out-this-way-ln/ The webnovel is further along but hasn’t really been updated so I think author is focusing on light novel. Not to mention the web novel translation makes some parts hard to understand so might as well stick around for LN? also good but web novel translation can get iffy sometimes so maybe go with LN? https://www.novelupdates.com/series...e-piggy-duke-this-time-i-will-say-i-like-you/ https://www.novelupdates.com/series/shini-yasui-koshaku-reijo-to-shichi-nin-no-kikoshi/ This is a must. Has various possible romance targets (and amazing plot) but we haven’t seen a competed ship yet. Since it doesn’t have harem tag it shouldn’t end up with a harem at least this is great too (https://www.novelupdates.com/series/mushoku-no-eiyuu-betsu-ni-skill-nanka-iranakattan-daga/) though romance is a bit later MC does have kids with her what I’ll say about this is that MC is the single most OP and broken character I have ever seen in any fictional world ever (even the worst SCPs and such can’t compare to him) even though his power isn’t “conventional” or perhaps he is so strong because it is unconventional https://www.novelupdates.com/series/instant-death/ https://www.novelupdates.com/series/the-healer-banished-from-the-party-in-fact-is-the-strongest/ This is an option you choose between web novel and light novel https://www.novelupdates.com/series/the-saints-magic-power-is-omnipotent-wn/ In any case all of these recommendations are on that series finder link I posted up top. You’ll be able to find stuff you like if you’ll put in some time
Transmigrator meets Reincarnator is decent,though note it's by a CN author/set in a feudal-ish china type place so it doesn't hit *all* your preferred criteria.