dont mix business with pleasure!
megumi to tsugumi
kiraide isasete
honto yajuu
unromantic
stranger than friends (seme is a bit flawed but not a red flag)
boss bitch baby (cant remember much but im positive the seme is a green flag)
the best smell (doesnt have smut so there's no seme but the relationship is super fluffy with almost no angst)
peach and her papas (no smut but super cute, green flags, lots of communication)
kisses x kiss x kisses (same as the above two manhwas)
the story of you x me (same as above three)
njirameba koi
icika, bachika
semantic error (enemies to lovers but seme isnt exactly a red flag. hes annoying but not evil)
these are all like super popular lmao i read mainstream shit most of the time. hope u find something u like!
https://www.mangago.zone/read-manga/when_the_killer_falls_in_love/ My personal favourite of those
Or at the barest of minimums, no shitty red flags like Jinx or Stigma? Something like Dangerous Convenience Store or Bye Bye where the seme isn't a raging bag of trash and I don't actively root for him to die.
edit: thank you!!