Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru
The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat

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Series that feature assassins, hitman, etc.

Part 2 => https://myanimelist.net/stacks/9970

If you look for manga about assassins, check out the list!

The story has a protagonist in a Polyamory with romantic development in Fantasy/Isekai. Includes 'Polygamy with romantic development', 'Multiple Lovers/Multiple Partners in an open romantic relationship', or an open romantic relationship with a harem. Also True Harem, Harem Ending, Harem-seeking, Hard-Working, Devoted, Couple Growth, First-time Intercourse, Marriage tag.

(PART 1) https://myanimelist.net/stacks/36913

Additional (currently no MyAnimeList page):
-(Manhwa) Trapped in a Hentai Game Academy / Trapped in the Academy's Eroge (currently 105 chapters)
-(Manhwa) Surviving in a Romance Fantasy Novel (Currently Reading to further confirm)(Unless read Web Novel)
-(Chinese Manhua) Yao Shen Ji / Tales of Demons and Gods (currently 478 chapters)
-(Light Novel) Bannousugiru Souzou Skill de Isekai wo Shitataka ni Ikiru! / Chronicles of a Creative Different World Reincarnation (completed at Volume 5)
-(Manga) Ii go mibunda na. Ore ni kure yo. / What Good Social Status You Have. Give It to Me. (Unless read Light Novel)
-(Manga) Isekai de Kuchizuke wo! Tensei Sekai wa Unmei no Hito de Michiteiru (Currently Reading to further confirm)
-(Manga) Maou wo Taoshita Ore ni Matteita no wa, Sewazuki na Yome to no Ichaicha Renkin Seikatsu datta / After Defeating the Demon King, What Awaited Me Was a Lovey-Dovey Alchemical Life With a Caring Wife (currently 27 chapters)
-(Manga) Doryoku wa Ore wo Uragirenai (Currently Reading to further confirm)(Unless read Light Novel)
-(Manga) Potion Kouji ni Sasensareta Ore Renkinjutsushi, Bishoujo ni Rachisare Ikoku de Itsunomanika Eiyuu ni naru / I, Who Was Demoted to a Potion Factory, Was Kidnapped by an Elf and Became an Alchemist in a Desert Country (Currently Reading to further confirm)(Unless read Web Novel)
-(Manga) Kiss kara Hajimaru Isekai Harem ~Ipputasai no Sekai ni Tensei shita node Kami ga Kimeta Unmei no Hito wo Sagashimasu~ (Currently Reading to further confirm)

𝙍𝙀𝙂𝙐𝙇𝘼𝙍 𝙐𝙋𝘿𝘼𝙏𝙀𝙎 | 𝙌𝙐𝘼𝙇𝙄𝙏𝙔 𝙎𝙀𝙇𝙀𝘾𝙏𝙄𝙊𝙉 | 𝙑𝙄𝙎𝙄𝙏 𝙋𝙍𝙊𝙁𝙄𝙇𝙀 𝙁𝙊𝙍 𝙈𝙊𝙍𝙀
Manga where the main character transports to another world.

The protagonist is reborn beginning a new life as a baby/infant, attaining a new physical body and identity in the world. Includes Passage of Time, Age Progression, Second Chance, Reincarnation tag.

(PART 1) https://myanimelist.net/stacks/37356

Additional (currently no MyAnimeList page):
-(English Original Webtoon) The Beginning After The End
-(Japanese Webtoon) Yousei Hime ga Fukushuu wo Kimeta Wake / The Fairy Princess Has Decided to Take Revenge
-(Manhwa) The Golden-Haired Summoner
-(Manhwa) Princess Player
-(Manhwa) Born as the Daughter of a Lowly Concubine / I Was Born as The Daughter of a Low-Ranking Concubine
-(Manga) Koutei no Mago ni Tensei suru Koutei
-(Manga) Tensei Renkin Shoujo no Slow Life / Reincarnated Alchemy Girl's Slow Life