https://www.mangago.zone/read-manga/sonna_ni_iu_nara_daiteyaru/....he's not crazy or something but lives a double life
https://www.mangago.zone/read-manga/double_face_niha_kanawanai/
double life as in intentional fake public persona
https://www.mangago.zone/read-manga/isn_t_being_a_wicked_woman_much_better/
https://www.mangago.zone/read-manga/the_one_within_the_villainess/
double life as in secret identity
https://www.mangago.zone/read-manga/academy_s_undercover_professor/
https://www.mangago.zone/read-manga/the_deviless_s_impression_of_a_princess/
https://www.mangago.zone/read-manga/the_strongest_dull_prince_s_secret_battle_for_the_throne/
https://www.mangago.zone/read-manga/breaking_news_marriage_with_the_archduke_i_know_now/
https://www.mangago.zone/read-manga/slime_saint/
https://www.mangago.zone/read-manga/the_white_lion_s_secret_bride/
https://www.mangago.zone/read-manga/aristit_was_blessed_with_a_curse/
Looking for Mangas or manhwas where the Mc lives a double life. Like he pretends to be a nerd or a model citizen but in reality he's crazy