i think these are pretty wholesome (most of my recs r slice of life)
https://www.mangago.me/read-manga/machida_kun_no_sekai/
https://www.mangago.me/read-manga/that_girl_is_not_just_cute/
https://www.mangago.me/read-manga/hajimete_no_suwa_san/
https://www.mangago.me/read-manga/bonnouji/
https://www.mangago.me/read-manga/daybreaking_romance/
https://www.mangago.me/read-manga/my_cute_beast/ (spoiler : eventhough its cute the conflict here boils my blood, their exes wont leave them alone smh)
https://www.mangago.me/read-manga/my_cute_bedfellow/ (smut)
https://www.mangago.me/read-manga/koori_zokusei_danshi_to_cool_na_douryo_joshi/
https://www.mangago.me/read-manga/futari_ashitamo_sorenarini/
https://www.mangago.me/read-manga/ookiku_nattara_kekkon_suru/
https://www.mangago.me/read-manga/kuuki_ga_yomeru_shinnyushain_to_buaiso_na_senpai_no_hanashi_serialization/
https://www.mangago.me/read-manga/is_it_a_fortune_or_is_it_a_woe/
https://www.mangago.me/read-manga/yoshioka_san_is_in_a_bad_mood/
https://www.mangago.me/read-manga/you_don_t_want_a_childhood_friend_as_your_mom/ (you might not be that satisfied with ending but still cute)
https://www.mangago.me/read-manga/boku_no_kokoro_no_yabai_yatsu/ (kinda weird at first but it'll get to it)
https://www.mangago.me/read-manga/himeno_chan_ni_koi_wa_mada_hayai/ (elementary student puppy love)
https://www.mangago.me/read-manga/patissier_san_to_oujo_san/
https://www.mangago.me/read-manga/please_go_home_akutsu_san/
https://www.mangago.me/read-manga/mobuko_s_love/
https://www.mangago.me/read-manga/kondo_wa_korosaretakunai_azarashi_san/
https://www.mangago.me/read-manga/spy_x_family/
https://www.mangago.me/read-manga/the_story_of_a_girl_with_sanpaku_eyes/
https://www.mangago.me/read-manga/jijyou_wo_shiranai_tenkousei_ga_guigui_kuru/
https://www.mangago.me/read-manga/kubo_san_wa_boku_mobu_wo_yurusanai/
https://www.mangago.me/read-manga/my_new_wife_is_forcing_herself_to_smile/
https://www.mangago.me/read-manga/tonari_no_furi_san_ga_tonikaku_kowai/
https://www.mangago.me/read-manga/the_story_of_an_engaged_couple_that_doesn_t_get_along/
https://www.mangago.me/read-manga/gokushufudou_the_way_of_the_house_husband/
https://www.mangago.me/read-manga/hitomi_chan_is_shy_with_strangers/
https://www.mangago.me/read-manga/kijima_san_to_yamada_san/
https://www.mangago.me/read-manga/tedama_ni_toritai_kurokiya_san/
https://www.mangago.me/read-manga/what_i_get_for_marrying_a_demon_bride/
https://www.mangago.me/read-manga/sukinako_ga_megane_wo_wasureta/
https://www.mangago.me/read-manga/kuchi_ga_saketemo_kimi_ni_wa_2020/
https://www.mangago.me/read-manga/toorigakari_ni_one_point_advice_shiteiku_type_no_yankee/
https://www.mangago.me/read-manga/majo_senpai_nichijou/
https://www.mangago.me/read-manga/first_love_is_now_first_love_letter/
https://www.mangago.me/read-manga/paperbag_kun_is_in_love/
https://www.mangago.me/read-manga/make_heroine_wo_katasetai/ (oneshot)
https://www.mangago.me/read-manga/bokura_no_complex/ (oneshot)

Please recommend lengthy Manhwa/Manga with wholesome story line, it would be nice if it's completed too. TIA