LIGHTSUM has treated fans to some behind-the-scenes footage. The group uploaded an MV behind video for their song “どうして (Doshite)” on October 7, with English subtitles included, as shared in an r/kpop post.
The clip, titled “LIGHTSUM - ‘どうして (Doshite)’ MV Behind (261007) [ENG SUB],” was posted on the group’s official YouTube channel, LIGHTSUM Official, and picked up by the r/kpop community the same day. The “261007” tag places the footage on October 7, 2026.
According to the original post, the video offers a look at the making of the music video for “どうして (Doshite)” — literally “Why” in Japanese — and ships with English subtitles so international fans can follow along.
The thread carried no substantive comments at the time of writing, so no fan reactions were available to quote.
“どうして (Doshite)” marks LIGHTSUM’s latest Japanese-language output to get the full music-video treatment, with the behind-the-scenes release arriving the same week as the filming date code suggests.
The full behind-the-scenes clip is now available to watch on the group’s official YouTube channel.
