I am looking for manhwa or novels where the transmigrated Fl doesn't act childish and acts like an adult like I Became The Male Lead’s Adopted Daughter
You can check some of these - The Empress’ Livestream ~ Gender Bender, Isekai, Comedy, Kingdom Building - Legend of Concubine’s Daughter Minglan ~ Transmigration, Politics, Romance, Angst - Back to the Sixties: Farm, Get Wealthy & Raise the Cubs ~ Slice of Life, Transmigration / Reincarnation, Romance, lil bit of smut at the start, Business Management - Counterattack of the Cannon Fodder Chamber maid ~ Romance, Angst, Ancient Times, Transmigration - Returning ~ Modern Times, Lots of Smut, Angst, really good plot - My Lord is A Stone ~ Transmigration, Ancient Times, Comedy, Angst