On August 1 and 2 (local time), BTS successfully held two nights of concerts for their BTS WORLD TOUR "ARIRANG" at MetLife Stadium, drawing a total of more than 157,000 attendees. Not only did ARMYs from around the world travel to New Jersey to reunite with BTS after seven years, but numerous celebrities also joined the electric atmosphere.

During the first night's concert, RM excitedly announced, "King of New York, big Nas is here tonight!", while calling the legendary rapper "the artist who dominated my whole teenage." Jazz musician Jon Batiste later shared on social media that he was so excited he almost forgot his phone, while Broadway legend Lea Salonga continuously uploaded photos and videos from the concert, showering the members with praise.

Following their New Jersey shows, BTS continued the North αмєяι¢αn leg of their tour with their next stop at Gillette Stadium in Foxborough, Boston, on August 5 and 6. With little time to rest between venues, the group departed for Boston on the morning of August 3 (local time), just one night after wrapping up their MetLife concerts. j-hope and V also kept fans updated by posting a series of photos and videos on their Instagram Stories.

However, one particular detail involving SUGA in j-hope's latest post quickly became a hot topic of discussion among ARMY!

Specifically, in a rear-view photo shared by j-hope, SUGA unintentionally revealed a striking tan line on his legs. The skin from his thighs down to his calves had noticeably darkened from sun exposure, while his feet and part of his ankles—covered by his shoes and socks—remained almost glowing wнιтe. Fans also pointed out that a similar contrast had previously been spotted on his arms in another photo shared not long ago.

According to fans, the most likely reason behind these dramatic tan lines is SUGA's growing pαѕѕion for running. Whenever he has been spotted jogging, the rapper is usually dressed in a lightweight windbreaker, a cap, running shoes, and socks that extend above his ankles, paired with athletic shorts. As a result, his legs are left exposed to the sun for hours during his runs, gradually becoming more tanned.

SUGA's dedication to running has also become soмєтнing both the members and fans have recognized. He is so pαѕѕionate about it that in May, he participated in the 12-kilometer Bay to Breakers race in San Francisco just before BTS' concert at Stanford Stadium. Ahead of the group's Busan concert, he was also seen completing a 10-kilometer run immediately after finishing rehearsal, despite it already being nighttime. His consistency in training regardless of the time or his packed schedule clearly shows that running has become one of his biggest pαѕѕions recently.

What makes the story even more amusing is that SUGA's legs were once famous within the fandom for being... exceptionally fair, smooth, and slim. Fans often joked that his legs were so beautiful that even many women would be jealous. SUGA himself once acknowledged this by posting a photo of his legs on Twitter with the humorous caption: "My name is SUGA. I'm still a trainee but i have a legs like SNSD".

But things have changed! Although SUGA carefully prepares for every run by wearing breathable athletic clothing, carrying a water bottle, and even applying sunscreen—even during evening runs—he seems to pay surprisingly little attention to protecting his legs from the sun. Fans couldn't help but joke that he now seems perfectly willing to trade his famously pale legs for his newfound love of running.

On the other hand, considering SUGA's past comments about his legs, the change actually makes a lot of sense.The rapper once admitted that he felt his overly pale and slender legs made him look less masculine and had become one of his biggest insecurities as a man. He also expressed his wish for his legs to become less skinny and less pale. Many fans now believe that his commitment to running is a part of his effort to achieve the stronger, more masculine appearance he has long wanted.

The discovery quickly became another entertaining topic within the fandom, with fans leaving a flood of amusing reactions, including: "Why he's soo cute", "Lol that's hilarious", "He's covering everything but his hands and legs", "Like the black cat wearing socks", "A whore with a TAN. What is this alternate reality we’re living in?", "His runner tan I COULD DI3", "The running tan lines is absolutely frying me as a fellow runner", "The wнιтe ankles and tanned legs, Still prettier than mine, I'm so jealous", "He really dedicated his legendary pale legs for running", "Anything for his running era, I guess", "He's so committed to running that he doesn't even care about the tan anymore",...