Does Akai Shuichi know Conan is Shinichi? – Quora. He does. He figured it out on his own during episodes 690-1, but he probably had been suspecting since a while ago because he realized Conan looked very similar to kid Shinichi whom he’d met 10 years ago.
The manga series Detective Conan (Case Closed) is most probably going to end in the near future. Though author Gosho Aoyama hasn’t specified a clear date or the exact number of episodes and chapters he plans on writing, he did say that he has the final episode very nearly completed, hidden in his work safe in his home.