India, April 8 -- BTS is creating history with their comeback album Arirang, which sold a staggering 4 million copies on its first day. The album topped international charts, surpassing the group's previous first-week sales record, and its lead track, Swim, dominated iTunes in 90 countries.

A few days after the album's debut, the group also released a Netflix documentary - BTS: The Return - that offered rare behind-the-scenes access to their daily lives and the process of making the album. For a part of the documentary, BTS members - RM, Jin, Suga, J-Hop, Jimin, V, and Jungkook - stayed at a villa in Los Angeles. This is where they worked together on Arirang.

The Netflix documentary BTS: The Return offers a glimpse of the Los Angeles es...