Can someone recommend me where the mc get reincarnated as an npc then the male lead is the...

https://www.mangago.zone/read-manga/the_villain_s_savior/ (MC = side character, ML =Villain, TRIGGER WARNING: The ML is the trigger warning, happy ending)

This one I love and recommend
https://www.mangago.zone/read-manga/for_my_abandoned_love/

FL is a side chara, her ML is the second ML in the og storyline, the og main charas is quite leaning to be the villains in this manhwa

https://www.mangago.zone/read-manga/i_got_married_to_a_villain/
isekaid as side character, villain supposed to kill but end up marrying

https://www.mangago.zone/read-manga/as_you_wish_prince/
isekaid, meet villain, romance! (gets a little mary sue-ish towards the middle end, but eh)

https://www.mangago.zone/read-manga/the_villainess_want_to_marry_a_commoner/
not actually what youre asking for, but its so fucking cute. Not an OGFL or OGML in sight

https://www.mangago.zone/read-manga/i_m_the_ex_girlfriend_of_a_soldier/
isekaid as the OGFL, hate the OGML, gets together with the villain

https://www.mangago.zone/read-manga/a_villain_is_a_good_match_for_a_tyrant/
also not what youre asking for, its not isekai i dont think, but villain prospects endure

https://www.mangago.zone/read-manga/i_picked_up_the_second_male_lead_after_the_ending/
isekaid as NPC, romance with the villain ensues.

https://www.mangago.zone/read-manga/i_have_become_a_hero_s_rival/
AHHHH read this, isekaid as a side character, romance ensues (OGML viewed as trash)

https://www.mangago.zone/read-manga/revenge_wedding/
once again not what you asked for, but read this anyways

https://www.mangago.zone/read-manga/failed_to_abandon_the_villain/
im snoozing but i have to include it

https://www.mangago.zone/read-manga/villainess_maker_1/
cmonnnnnn ayyyyyyyy you know i had to include it ayyyyyyyy

Thanks guys X))) have a happy Christmas:)))))

OHH, I read this one, ait was good