Where the dudes are talking at the bar and noticed the bartender’s eye change from dark to gold.
http://www.mangago.me/read-manga/love_shuttle/uu/ibx_chapter-37/pg-26/
You're right, it could be that Taehan's not the only one, but there's also all kinds of issues with color inaccuracy that go along with offset printing in RL as well as online, and non-compliance across platforms online, so it could be our monitors. Also, he's looking off to the side in the second panel (or first...), where you'll only catch the dark outline of the iris. That might also be it





What if the "hounds" are the kids Guwon raises???? That's why he helped the kids and they love him. So the current hounds are previous kids he saved before in this time loop thing.(づ ̄ ³ ̄)づ
Wait actually tho you could be on to something (⊙…⊙ ). Like that could be a good explanation why the Hounds are such total fanatics to Guwon. Like if what if that little girl Soo-ah was actually that female Hound?