Cool! BTS! I would suggest Blackpink, but there are bad words, so BTS. Or Txt. Twice. there are other ones I love, but those are the most popular ones without bad words, most of the time. BTS is really good, they're my fave, and Jungkook is my bias. What I listed was K-pop groups, but if you meant songs, then 'Butter', 'Permission to Dance', 'Boy With Luv', 'Mikrokosmos', and 'Euphoria' by BTS are all great. For songs by girls, then I would suggest 'The Feels', 'What is Love', 'Fancy', 'Cry for me', 'More & More', and 'Scientist' by Twice. Maybe 'Ddu-du-ddu-du' or 'See you Later' by Blackpink, that doesn't have any bad words, I'm pretty sure. Maybe 'Savage' by aespa, that used to be my fave song, and I learned the dance and everything, hahahaha.
Some K-pop songs by those groups have bad words, but rarely, Blackpink has bad words, not too many though.
That's not too personal to me! I am strong Christian. And I mean, really strong Christian. Are you?
~ Your friend, Wraya <3