In the space of just five years, Twice have taken the K-Pop world by storm.

With hundreds of millions of views on YouTube, a sell-out world tour and record-breaking album sales under their belts, Twice have well and truly earned their place in the K-Pop hall of fame. And they're only just getting started.

Twice: The Story of K-Pop's Greatest Girl Group tells the amazing story behind one of the most-loved groups of our time. Covering their triumphs and setbacks, the making of everyone's favourite tracks - including 'Like Ooh-Aah', 'Cheer Up' and 'Likey' - and their unique sense of style, this in-depth, unofficial guide is the perfect gift for any Twice fan.

With dedicated profiles of each band member, Twice looks at how these talented and unique superstars have grown, and what's to come in their bright future.

An expert on Korean culture and K-pop, Jamie Heal is an established author who has written on a range of subjects, including sport, music and comedy. He lives in London.