'Arrow' Season 3: Karl Yune to play Maseo Yamashiro, Katana's husbandAdd to Favorites | Arrow
According to TVLine, Maseo is one of Oliver's handlers when he is taken to Hong Kong by A.R.G.U.S. Both a teacher and a friend to Oliver (Stephen Amell), Maseo is also the husband of Tatsu Yamashiro -- also known as Katana.
RELATED: Devon Aoki cast as Katana.
The full relationship between Oliver and the Yamashiros will only become clear when "Arrow" Season 3 premieres Wednesday, Oct. 8 at 8 p.m. ET/PT on The CW.