"Nation's MC" Yoo Jae Suk has been getting noticed for his fit physique�once again.

A post titled "Yoo Jae Suk's unexpected arm muscles" was posted onto an online community recently, and it's been creating buzz ever since.

The revealed photo captures Yoo Jae Suk and fellow 'Infinity Challenge' cast member HaHa during filming.

Netizens commented, "Nation's MC, your arm muscles are splendid," "Your t-shirt is tight on you. Cool muscles," "The best husband material," and "Unexpected. I'm going to exercise too."

Take a look at some of that hot eye candy below!

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Source: Asia Today via Nate