ahh sorry this is late, i'm going through linepost to see what i may have missed! tae here is obsessed with dogs and they have some other likes in common. he could have been that person on the elevator who saw his dog and spent the entire ride at dog's eye-level cooing a the pup? and then of course when they reached ground level got embarrassed and was like "oh your dog is so sweet and cute" and they could have started talking that way?