Art is subjective, but I don't think any of these are unappealing:
Completed (Fluff):
https://www.mangago.me/read-manga/exciting_feelings/
https://www.mangago.me/read-manga/mage_demon_queen/
https://www.mangago.me/read-manga/the_daughter_of_evil_and_miss_devil/
https://www.mangago.me/read-manga/blooming_sequence/
https://www.mangago.me/read-manga/bead_master/
https://www.mangago.me/read-manga/dallaeya/
https://www.mangago.me/read-manga/hertz_around_you/
https://www.mangago.me/read-manga/her_mountain_her_ocean/
https://www.mangago.me/read-manga/clandestine_affair/
https://www.mangago.me/read-manga/relationship_guidelines/
https://www.mangago.me/read-manga/sora_haena/
https://www.mangago.me/read-manga/ring_my_bell/
https://www.mangago.me/read-manga/my_princess_charming/
https://www.mangago.me/read-manga/after_the_curtain_call/
https://www.mangago.me/read-manga/soulmate_yuri/
https://www.mangago.me/read-manga/ouji_sama_nante_iranai/
On-going (Fluff):
https://www.mangago.me/read-manga/my_food_seems_to_be_very_cute/
https://www.mangago.me/read-manga/lass_2/
https://www.mangago.me/read-manga/the_heart_of_the_thorns/
https://www.mangago.me/read-manga/foxes_always_lie/
https://www.mangago.me/read-manga/love_gives_me_superpowers/
https://www.mangago.me/read-manga/my_ex_girlfriend_became_my_boss/
https://www.mangago.me/read-manga/unnie_i_like_you/
https://www.mangago.me/read-manga/bai_lijin_among_mortals/
https://www.mangago.me/read-manga/listening_to_the_stars_bbl_scans/
https://www.mangago.me/read-manga/sherbet_above_the_sea_of_fog/
https://www.mangago.me/read-manga/the_song_that_transcends_this_world/
https://www.mangago.me/read-manga/i_don_t_really_miss_you_i_m_in_the_apocalypse/
https://www.mangago.me/read-manga/i_ll_enjoy_my_route_even_if_i_can_t_change_it_athrea_scans/
https://www.mangago.me/read-manga/transmigrating_as_a_secretly_illegitimate_millionaire_heiress_i_try_to_curry_favor_with_the_real_heiress_to_survive/
https://www.mangago.me/read-manga/toward_the_blue_athrea_scans/
https://www.mangago.me/read-manga/that_time_i_was_blackmailed_by_the_class_s_green_tea_bitch/
https://www.mangago.me/read-manga/summer_trend/
https://www.mangago.me/read-manga/there_are_always_teachers_who_want_to_ask_out_parents_unofficial/
https://www.mangago.me/read-manga/blood_time/
https://www.mangago.me/read-manga/dang_e_yi_yu_dao_bing_jiao/
https://www.mangago.me/read-manga/please_bully_me_miss_villainess/
Completed (Angst):
https://www.mangago.me/read-manga/a_joyful_life/
https://www.mangago.me/read-manga/her_shimcheong/
https://www.mangago.me/read-manga/long_awaited_feelings/
https://www.mangago.me/read-manga/living_will/
https://www.mangago.me/read-manga/seasons_in_bloom/
https://www.mangago.me/read-manga/huijin_huayuan/
https://www.mangago.me/read-manga/getting_to_know_grace/
https://www.mangago.me/read-manga/i_love_amy/
https://www.mangago.me/read-manga/the_sound_of_a_butterfly/
https://www.mangago.me/read-manga/final_film/ (short story)
https://www.mangago.me/read-manga/only_need_to_love_once/ (one-shot)
On-going (Angst):
https://www.mangago.me/read-manga/the_wind_spell/
https://www.mangago.me/read-manga/artificial_temperature_36_7_c/
https://www.mangago.me/read-manga/scarlet_bloom/
https://www.mangago.me/read-manga/my_monster_detective/
https://www.mangago.me/read-manga/i_think_you_are_athrea_scans/
https://www.mangago.me/read-manga/my_god_my_only_one/
https://www.mangago.me/read-manga/indulging_a_crazy_beauty/
https://www.mangago.me/read-manga/fall/ (read season 2 here: https://www.mangago.me/read-manga/falling_athrea_scans/)
Completed (Smut):
https://www.mangago.me/read-manga/sadistic_beauty_side_story/
https://www.mangago.me/read-manga/moonlight_garden_kang_unnie/
https://www.mangago.me/read-manga/opium/
https://www.mangago.me/read-manga/kill_switch/
https://www.mangago.me/read-manga/pulse_ratana_satis/
https://www.mangago.me/read-manga/just_right_there/
https://www.mangago.me/read-manga/hateful_lady/
https://www.mangago.me/read-manga/bad_thinking_diary/
https://www.mangago.me/read-manga/fly_like_a_butterfly_sting_like_a_bee/
https://www.mangago.me/read-manga/the_playgirl_and_the_prince/
https://www.mangago.me/read-manga/eat_u_up/
https://www.mangago.me/read-manga/pet_s_aesthetics/
https://www.mangago.me/read-manga/office_sweet_365/
https://www.mangago.me/read-manga/love_does_not_fade/
https://www.mangago.me/read-manga/are_you_only_going_to_study/
https://www.mangago.me/read-manga/love_my_boss_wife/
https://www.mangago.me/read-manga/talk_dirty_to_me/ (BDSM)
https://www.mangago.me/read-manga/program_me/ (BDSM)
https://www.mangago.me/read-manga/suimitsutou_ha_shoujo_ni_kajirareru/ (attempted gangrape on a side character)
https://www.mangago.me/read-manga/addictive_bing_zi/ (BDSM)
https://www.mangago.me/read-manga/to_my_neighbor_angel/ (in all chapters except the last two the FL has a dick)
https://www.mangago.me/read-manga/for_garbage/ (adultery)
https://www.mangago.me/read-manga/marie_and_alex/ (BDSM)
https://www.mangago.me/read-manga/all_s_nice/ (dub-con)
https://www.mangago.me/read-manga/damp_ascension/ (one-shot;dub-con)
https://www.mangago.me/read-manga/hottie_s_heel_uncensored/ (one-shot;BDSM)
https://www.mangago.me/read-manga/the_soaking_wet_unnie_next_door_wants_me_to_touch_her_down_there/ (one-shot)
On-going (Smut):
https://www.mangago.me/read-manga/drunken_my_boss/
https://www.mangago.me/read-manga/trash_flower/
https://www.mangago.me/read-manga/please_pick_my_love_too/
https://www.mangago.me/read-manga/sexy_dynamite_dungeon/
https://www.mangago.me/read-manga/stop_fighting_go_to_bed_athrea_scans/
https://www.mangago.me/read-manga/we_never_even_broke_up/
https://www.mangago.me/read-manga/other_than_my_friend_s_sister_something_else/
https://www.mangago.me/read-manga/drown_in_the_angel_s_swamp/ (age gap, drugging and sexual assault [not between MC and FL])
https://www.mangago.me/read-manga/lady_black_is_depressed/ (non-con in chapters 14&15)
https://www.mangago.me/read-manga/only_to_you/ (BDSM)
can i get sum stories w the lades please??? full color. no unappealing art style please