With a surprising $400 million worldwide box-office performance in February, it makes perfect sense to have a "Kingsman: Secret Service" sequel based on Mark Millar's R-rated comic book "The Secret Service." However, The Wrap reports that there is no definite release date for the sequel yet.

"Kingsman: Secret Service" director Matthew Vaughn has been positively vocal about a sequel. "I genuinely hope that one day I can sit here and talk about Kingsman 2 with you," the director said while promoting the movie in an interview with Empire.

In an exclusive sit-down with USA Today, the director of blockbuster hits "X-Men: First Class" and an earlier collaboration with Millar, "Kickass" said, "The sequel will be 'This is the modern-day gentleman spy.' Because Harry isn't."

Vaughn also  recognizes that the comic book is essentially about the origins of young spy Eggsy Unwin, played by newcomer Taron Egerton. "I joke that we've made the prequel to the Eggsy movie," the director said.

Although the comic book revolved largely around Eggsy, Colin Firth's formidable presence in the movie as veteran spy Harry Hart is difficult to ignore. In the movie, Harry was shot in the head by villain, Samuel L. Jackson's Richmond Valentine. But fans should not worry just yet, as he might just be off hiding somewhere, in a manner that only bad-ass spies could pull off.

"A lot of people are very upset that Colin might not be in the sequel but I'm coming up with ideas at the moment. If people buy tickets in America, I've got a feeling we'll figure out a way for having Colin back," Vaughn revealed.

And people in America did buy tickets. "Kingsman: Secret Service" garnered more than $126 million in the US, while majority of ticket sales were sold overseas, BoxOffice Mojo reports. The movie's biggest fanbase apparently is in South Korea where it was reported to be the biggest-selling film of the year so far. The DVD of the movie is set to be released in June.

Meanwhile, Vaughn has also been reported to direct another comic-to-movie franchise. According to The Hollywood Reporter, the director is in negotiation to reboot the classic 1930s Alex Raymond comics. The first film to feature the superhero was released in 1980, entitled "Flash Gordon," has gained a following among sci-fi and fantasy fans and is said to inspire a young George Lucas.

On the other hand, Vaughn is not the only "Kingsman" cast with an upcoming book-to-movie adaptation. Taron Egerton is also featured in the crime thriller biopic "Legend" starring Tom Hardy based on the book "The Profession of Violence: The Rise and Fall of the Kray Twins" by John Pearson.