"You're happy," Scarlett Johansson said, strolling in after Chris Evans, her 32-year-old co-star.
"This is the last one, Scarlett," said Evans laughingly, oblivious to the gathered journalists looking at them.
"For now, until I interview you..."
"So what are you doing for dinner later?" Evans asked Johansson in his own mock interview.
There are many reasons for the US actor to be happy.
For starters, he's back wearing the iconic stars-and-stripes costume as Captain America, aka Steve Rogers.
Captain America: The Winter Soldier, which is now showing in cinemas, follows the super-soldier's life after the massive alien invasion that happened in 2012's The Avengers.
Now working for spy agency S.H.I.E.L.D., Rogers is still trying to adjust to the modern world when he gets embroiled in a conspiracy that puts the world at risk.
A man stuck in the World War II period, where good and evil is black and white, Rogers struggles with the grey areas of diplomacy and politics - which is where Johansson's character, highly-trained spy Natasha Romanoff aka the Black Widow and Captain America's new sidekick, comes in.
You can say she's the yin to Cap's yang. His morals are strong while hers are questionable. He can't lie, but that's how she makes her living.
The 29-year-old US actress and Evans clearly have a strong chemistry, as evidenced by their playful banter throughout our interview at Park Hyatt Beijing on Monday.
"Chris and I have the good fortune of working together for four films and we've known each other for over 10 years," said Johansson.
"These (action) movies can be tedious to make at times. The hours are long.
"It helps that Chris and I have this familiarity with each other. We're in the same world. We can keep each other going when things seem..." "...never ending," Evans interrupted.
"We have a wonderful friendship, and that naturally goes on-screen," said Johansson.
Johansson and Evans first worked together in The Perfect Score in 2004. Their next collaboration was in The Nanny Diaries (2007), followed by The Avengers.
They will also work together on The Avengers sequel, Avengers: Age Of Ultron.