"Among the hottest topics for documentaries aired on streaming sites are food, wildlife, and artworks and cultural relics, followed by history," noted producer Zhu, a leading figure with Tencent Video, which boasts nearly 600 million registered users, according to latest data from QuestMobile.

"That is why we are investing in epic documentaries. War of Seven Kingdoms is the beginning. If the market feedback is good, we will surely produce more epics. And we will eye both domestic and overseas markets, such as Japan and South Korea," Zhu added.