A heartfelt moment unfolded as Nonoy Zuñiga and his son Ziggy shared an impromptu performance at the Barbershop of the Cosmopolitan Hotel and Casino in Las Vegas.

The known "King of Pop Ballads" of the Philippines beamed with pride as he watched his son's musical career take flight.

"I didn't expect that from Ziggy," Zuñiga said. "I thought he (Ziggy) was simple like all my children. The common denominator among parents is that even if your child is grown up, you still think of him as a child."

Zuñiga added that he thought Ziggy was initially hiding from him while learning how to strum the guitar or make his music, as the kid was shy growing up.

It turns out that with the help of YouTube, Ziggy honed his craft and expanded his knowledge of music.

And despite his music genre being different from Ziggy's, Zuñiga said he appreciates how his son values his talent.

"Our songs are 40 years apart but he (Ziggy) sings with gusto, with passion," the veteran singer said. "He doesn't only stand there."

Beyond making music, the OPM icon shared that keeping the right attitude is crucial to thriving and staying relevant in the entertainment industry.

"It's not only from your songs," Zuñiga said. "[It's] your attitude. You could be a very good singer, and have the looks, but if you don't have the right attitude, if you are rude especially with your words and you don't respect others, that's a No."

Zuñiga has concerts scheduled in the Philippines as well as in the U.S. next month.