There's several ways for male idols to get popular in korea.
1. Score hits and become influential idol producer: GD, Zico, Suga etc
2. To have outstanding visual and pursue acting, get cfs, brand deals example: Cha Eunwoo, L etc
3. To participate in mnet survival show and try to grab people attention by whatever charm u have and win the show, example: Kang Daniel etc
4. Be an ACE, great performer, multitalented person with oozing charisma example: Jungkook, Jimin, Taemin etc
5. Having great vocals and build successful solo career on top of that, example: Baekhyun etc
We still don't have popular male idol or what people like to call "it boy" in korea from 4th generation boygroups. Which one do u think is more achievable? and who do u think can achieve it? do u expect it from upcoming boygroups? or any else option? Also do u think is it possible for one to become popular in korea while his group is still nugu there?