They’ve been teasing it with tweets like

Rise & Shine @harimoto & I stoked to be lunching w/ the EXTRA SPECIAL guest star debuting in our upcoming NCISLA episode “Three Hearts”!

or

NCISLA “Three Hearts” Day 3: Wait till you guys see our special guest star’s tour de force performance. Living the dream w/ @Harimoto

via @DaveKalstein

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We got a glimpse at the table read

… but couldn’t really make him out…

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NOW we finally know:

Daniel Henney will be the “very special guest star” in the drama’s 20th Episode (airing as 21) of Season Five.

Cineasts might recognize him from his roles in X-Men Origins: Wolverine (2009) and The Last Stand (2013) whereas lovers of the ‘little screen’ might know him as “Michael Noshimuri” (who died by the hands of his brother) on Hawaii Five-0.

The episode will most likely air in April. Make sure to come back often and check for the airing date once it’s out…