I work in perfume and fragrances so I've actually smelled some of the ones they like. For example, Seonghwa from Ateez recently got Black Opium by YSL and that's one of the best ones we carry. A 20/10 for me. It's a dark, sweet, and somehow comforting smell. I'm always wearing that when I go to work. (Althought the original Opium fragrance by YSL is ass, very yucky.) I heard that Lee Know uses either Bleu de Chanel or frebreeze (he's crazy, love him) and honestly, the Bleu de Chanel is a 7/10 and frebreeze is... a 6/10. And Yeonjun and Soobin from TXT did an advertisement for Dior's Sauvage which is popular for many reasons, one being the fact that it's a nice smell. It's spicy and dark, strong but not overpowering.