If this news comes as a surprise to you, you clearly haven't been paying enough attention to Jaden's Twitter feed, where he has been vision boarding his intention to become a K-Pop star since last December. It's a classic case of #MeetsG-DragonOnce.
It's unclear at this juncture what it actually means to make non-Korean K-Pop (EXP's attempt didn't go so well), but I suppose we're going to find out. The reactions to Jaden's announcement were... mixed to say the least.
@officialjaden It's not kpop if you haven't trained under a Korean company and debut in Korea you know that right https://t.co/zhd5FiS3gc