Episode 10 of the Sakamoto Days anime has a new voice actor joining the cast. Masaaki Mizunaka (Ryuuen in Classroom of the Elite) will voice Wutang starting in next week’s installment.
Here’s a look at the character’s anime design and Mizunaka:

Wutang

Masaaki Mizunaka
There’s also an episode 10 preview:
Shueisha publishes Yuto Suzuki’s Sakamoto Days manga in their Weekly Shonen Jump manga magazine. VIZ Media also publishes an English-language version of the series.
Masaki Watanabe directs the TV anime at animation studio TMS Entertainment. with Taku Kishimoto (BLUE LOCK) on series composition and Yo Moriyama (MEGALOBOX director) on character designs.
VIZ describes the story:
Time has passed peacefully for Sakamoto since he left the underworld. He’s running a neighborhood store with his lovely wife and child and has gotten a bit…out of shape. But one day a figure from his past pays him a visit with an offer he can’t refuse: return to the assassin world or die!
Source: Comic Natalie