Japanese entertainment group Avex Group Holdings has said it will invest in John Woo's "Battle of Red Cliff," which is set to be China's most expensive ever film. Avex, a music label that has expanded its business to movies, said it would invest 20 million dollars with China's Chengtian Entertainment International in the latest film by Woo. "Battle of Red Cliff" will narrate the fiercest battle of the Three Kingdoms, the turbulent era in the third century AD that was turned into a classic of Chinese literature. AFP reports.