OMG it’s Jaeyi’s swimmer brother!! It seems like they r def setting him up to be a 2nd ML. In ch. 15 Jaeyi said something about him also having to have surgery for something and that he would take things from other people (presumably Jaeyi?). I wonder if he will bond with Ideum over their shared experiences and try to take him from Jaeyi because he knows they are connected in some way. I wonder if they are half brothers or something, because they don’t really look alike at all.