Singer Seo In Guk updated his Twitter page on August 6th with the post: "Not too long ago, I took the subway for the first time in a while," and uploaded the "proof-shot" above.

Wearing a simple black cap and a cyan shirt, the star can be seen striking a pose next to the Nakseongdae Station sign located in Line 2 of the Seoul Subway.

Fans left comments like, "You look so cute", "Taking a subway proof-shot must be the trend these days", "I wish I was there at that time", and more.

Meanwhile, Seo In Guk is currently busy filming tvN's new drama 'Reply 1997' as Yoon Yun Jae.

Source: Seo In Guk's Twitter