Bad Boy is a Manga/Manhwa/Manhua in (English/Raw) language, Manhwa series, english chapters have been translated and you can read them here. You are reading Bad Boy chapters on https://mangabtt.com, fastest updating comic site. The Summary is
I tried for 10 years to become her ideal type of good man but suddenly, she says she likes a bad man... Starting today, I am reborn as a bad man.