Responses
Spoilers
I think that's unlikely cause TW requested his parents to be moved away from the school where he was bullied and met Mike. Plus, Mike said something along the lines of not having seen TW in a long time and that he's a college student now, and I don't think he would say that if they were staying together when TW was in high school.
Spoilerish...
I wonder if Taewhan was staying with Mike and his family when he was in school with Yeonwu? I'm not sure if the time frame would match, because I'm not sure how old Taewan was supposed to be then but Taewan did say he was staying with a host family then to Yeonwu. If that's the case then its possible Yeonwu would have met Mike while he and Taewan were friends. Just a thought. I still think the guy coming to Yeonwu in the last raw is Smith though. I'm thinking at some point Taewan while come to Yeonwu's rescue from Smith, and seeing Yeonwu vulnerable will help Taewan to confide in Yeonwu about what he went through.